I used to have a collection of colored light bulbs. outside of the blacklight, my favorite was my coated red light bulb. I loved how it made the light creeping in from the outside look blue and made red objects look pale.
Because in school you have to sit there for half an hour (Or more, depending) to learn about the intricacies of the subject at hand, while on SciShow you spend maybe 3-10 minutes to learn just enough to make you look smart at parties.
This was such a satisfying video to watch, I've wondered for so long how it works and worked it down to two possible hypothesises of mine. Turns out both were oddly correct! *mind blown*
A few more things: 1. A material is a phosphor because it just happens to emit visible light when struck by invisible light. All materials that we can see emit visible light in some way. 2. Cathode ray tubes (CRTs) emit electrons at high speed onto a phosphor-coated screen. The mechanism that excites the electrons in this case differs from that of UV radiation. Electrons are excited by absorbing momentum instead of photons. 3. Phosphor materials continue to emit light for a while, the time depending on the material. 4. Phosphorus, the chemical element, glows due to the production of light-emitting molecules in the presence of oxygen. Chemical luminescence like this is different from phosphorescence, and is used by some living things to glow in caves and deep underwater.
dude i was seriously thinking about asking for you guys to do an episode on thiss like 4 days ago,spooky,you guys are in my head,well whomevers QQ it was,was in muh head!
I had a bumble bee hanging out around my blacklight one time (they really like the UV) and I noticed that the yellow parts of its body flounced a bright (but not a"neon" looking) shade of yellow. Ot was really neat and seems to happen with every bumble bee that has gone near the black light so far.
A blacklight is basically a fluorescent light without the fluorescent coating and with some filter blocking out any non-UV light instead. Or reversely you could say that a fluorescent light is a UV lamp made from an mercury/argon based gas-discharge lamp coated with a phosphor that fluoresces.
Small correction. At 1:06 you mention that "phosphors are substances that fluoresce" when actually phosphors phosphoresce and substances with fluorine fluoresce. Phosphorescence and fluorescence are two similar but different processes. In particular phosphorescence is much slower hence objects still glowing after the black light is turned off.
As a bouncer I've also used it to detect people to get drug tested, (at places where they had a zero tolerance politic) Small rim of white at the nostrils was a dead giveaway...
He mentions fungus; In our animal shelter, its the first way of checking an animal and diagnosing it during intake for Ringworm. While generally not such a horrible infection for people (put cream on it, slap a bandaid on, good to go) it is EXTREMELY infectious to cats (and to a far lesser extent, dogs). Blacklights help us stop one of the worst things possible in a cat shelter (this is assuming all cats are vaccinated against other diseases, such as panluke.) Thank you, Black light gods.
Hey Hey Hey! @SciShow I GOT A QUESTION! "If you stopped eating actual food and just took vitamin supplements for say a year or 2 what would happen to your body or would you be able to even last that long?"
We also use the same trick in radioactive signs, gun sights and key chains. Weak radiation from tritium gas will activate phosphors that release the energy via visible radiation, IE, light!
I found best black black light is 1 or 2 on a simple shop light fixture 4 feet long or best known as F30T8BLB . Use when dark and shows how dusty or many things on surfaces you might not want to see .
I would very much like to know how long it takes for moles to appear...they keep popping up on my face and arms and hands and it's like one day they're not there and the next they are. Am I just being unobservant, or do they really poof onto my skin overnight?!
@scishow loads people claim in videos they can make black lights out of a phone torch. Although all of them have used fluorescent yellow sharpies, not the actual invisible ones. I’m trying to find out if invisible ink actually would illuminate with the right clip-on filter. Would this be possible?
So is this UV light harmfull to people? I've been thinking about changing the lighting in my room from a normal lamp to some blacklights. Is it safe to do this? Or are there health risks involved?
What could happen if i would keep it on for hours at a time? The UV light is better in setting a mood, while watching a movie with a girl over, or even to keep on when playing games etc.
holy crap, i looked up this video due that very same black light led zeppelin poster.
8 ปีที่แล้ว
So the light absorbed by a phosphor has higher energy than the light emitted by it. What happens to that energy? Are these phosphors heating up or are they emitting other particles?
If you were in an All-White room, and you were to use a Black Light, then it would pretty much only be effective for making it dark. But if you're in the dark, and you turn it on, then basically you're just going to be sinking away into the pitch black of darkness.
Scishow needs to do a video about Dmitry Belyev. Spread this around if you agree.(maybe it will help get their attention) If you have no idea who he is look him up. Its really interesting!
So UV-A is pretty harsh. It's the bandwidth that gets deep below the skins surface and causes cell damage. I assume this is largely mitigated by the low power of the bulb emitting it. All that said, I definitely feel like I've gotten a light sunburn when in a room filled with Blacklight for too long.
So I have a blacklight above my bed that I use everynight, not as a nightlight, just as a reading light type of thing. I'm wondering if this can hurt my eyes in the long run
Thanks for this video. I am not sure but I think lower frequency electromagnetic radiation has less energy so what happen to the energy loss? Is it transformed into heat as energy "loss" is often (always?) expressed? Does that mean that phosphor under UV light also emit infrared? But IR is even lower frequency than light which would mean another energy leak so now I'm confused which means I'm now so sure about my initial premise. Can someone enlighten me?
I recently got a UV flashlight and was taking it around my house seeing what glowed and didn't glow, like you do, when I tried it on a potted plant the leaves showed up as a dark red. What's with that?
@scishow This video got me thinking about my eyes. For some reason my eyes change color from green to blue and everything in between. I swear they have actually been grey a couple of times. Do you think its from different light sources hitting my iris? Or just my genes? I would really like to know.
You probably have teal-grey eyes, in between green and blue, and depending on the light it can strengthen either the green in teal, the blue in teal or weaken them to where its grey, if you went into red-orange light it would neutralize the green-blue, etc.
Is the Fluorescing of something a chemical reaction? Does it generate heat? Does the paint or whatever breakdown? Will it stop fluorescing in the future?
Good question, I think it depends on the materials involved. Photosynthesis is related to that, and its certainly chemical. I think most of this is a change of energy form without chemical change though. Like loosening or tightening the string on a guitar. Though "glow sticks" for example and certainly a chemical reaction, and those run out of action after some hours usually. You can even boil them in water to get them to glow super bright = ) (Might want to taae precautions though as they're filled with glass which you can hear snap when you break the glass barrier between the two chemicals.)
+SciShow I have a question: Does all electromagnetic radiation travel with 'c' or is that only for the visible light spectrum? I think it's probably all radiation but I wasn't sure because it's called 'lightspeed', which makes it sound like it only applies to visible light. Pls explain.
Plants do this as well. Chlorophyll is fluorescent, but the emission is either quenched, too weak, or shifted out of the visible range in water. Hold up a vial of chlorophyll extract to the sunlight, and you'll see it turn red! Also, quinine (in tonic water) glows a beautiful cerulean blue
I learned this hack several months ago where 3 layers of tape--the first two colored blur in sharpie and the last purple--can achieve the same effect a black light does, causing phosphorous material to glow. why is that?
No mention of 1920's Depression glass? Seriously, shit guys! That is the coolest black light effect. Actual radiation emitting from glassware. I got a few at home under a black light. That green glow is lovely.
HEY GUYS! IF SOMEONE CAN ANSWER THIS QUESTION I WOULD BE EXTREMELY GLAD. okay here it is: if phosphor can absorb the black light and then transmit it at a lower frequency, where does the energy of the black light go? I think it heats the phosphor a little bit but im not sure.
![[UNCUT] ขยี้ "อลิส" ปม "คลิปลับแตงโม" เปิดชื่อคนพยายามแฮก "มือถือแตงโม" I คนดังนั่งเคลียร์I 10ก.พ.68](http://i.ytimg.com/vi/_RPLEIi5Sz8/mqdefault.jpg)
I used to have a collection of colored light bulbs. outside of the blacklight, my favorite was my coated red light bulb. I loved how it made the light creeping in from the outside look blue and made red objects look pale.
This is one of the best channels on TH-cam, I swear!!!
Loved this video btw!!*
Sir am afraid we are going to shutdown your account for two days
because you liked and replied to your own comment
vido sex
yes.
That shirt would be crazy as hell under a black-light, Hank... You should have totally done part of the video under a black-light.
I think you should have gone a little more into detail about why things glow certain colors and the common methods for creating the UV radiation.
Scorpions etc.
Why do I find this channel a lot more interesting than school
because school is trash and outdated.
unknown ? Lol k
+unknown ? so true
probably because your forced to Learn at school, while here you get to choose what to Learn and you want too
Because in school you have to sit there for half an hour (Or more, depending) to learn about the intricacies of the subject at hand, while on SciShow you spend maybe 3-10 minutes to learn just enough to make you look smart at parties.
In the 70s and early 80s I had black light posters, rug, bedspread, models, and stickers on the ceiling. Being a teen back then was fun.
Oh, how I miss my vintage LZ poster! Thanks. :)
"Never use the honeymoon suite" - Gordon Ramsey
Thanks for the info. You helped me write a whole paragraph on black lights for my project!
This is something that I should have already known. Thanks for posting.
We also use UV lights to help treat Jaundice.
This was such a satisfying video to watch, I've wondered for so long how it works and worked it down to two possible hypothesises of mine. Turns out both were oddly correct! *mind blown*
A few more things:
1. A material is a phosphor because it just happens to emit visible light when struck by invisible light. All materials that we can see emit visible light in some way.
2. Cathode ray tubes (CRTs) emit electrons at high speed onto a phosphor-coated screen. The mechanism that excites the electrons in this case differs from that of UV radiation. Electrons are excited by absorbing momentum instead of photons.
3. Phosphor materials continue to emit light for a while, the time depending on the material.
4. Phosphorus, the chemical element, glows due to the production of light-emitting molecules in the presence of oxygen. Chemical luminescence like this is different from phosphorescence, and is used by some living things to glow in caves and deep underwater.
dude i was seriously thinking about asking for
you guys to do an episode on thiss like 4 days ago,spooky,you guys are in my head,well whomevers QQ it was,was in muh head!
'...uses other than checking your bedsheets for fluids...' - That is actually a really good idea
Backlights matter
Wow very punny
wave or particle?
depends on how you look at it
Feeling the bern, huh?
+Connor.NJT || CondorK fuck trump
I had a bumble bee hanging out around my blacklight one time (they really like the UV) and I noticed that the yellow parts of its body flounced a bright (but not a"neon" looking) shade of yellow. Ot was really neat and seems to happen with every bumble bee that has gone near the black light so far.
A blacklight is basically a fluorescent light without the fluorescent coating and with some filter blocking out any non-UV light instead.
Or reversely you could say that a fluorescent light is a UV lamp made from an mercury/argon based gas-discharge lamp coated with a phosphor that fluoresces.
"oh baby .. ! Im... Im ..gonna Phosphor !.. "
Blacklight feels & is pure magic.
I can keep a scenic painting in my room that turns into a cool looking skull when partying!
Small correction. At 1:06 you mention that "phosphors are substances that fluoresce" when actually phosphors phosphoresce and substances with fluorine fluoresce. Phosphorescence and fluorescence are two similar but different processes. In particular phosphorescence is much slower hence objects still glowing after the black light is turned off.
good to know
Finally someone to talk about UV light & how it aid in a pandemic.
Thank you sir
Am i the only one who waited eagerly that he turns blacklights on and all of his Shirts dots glows like stars in the night?
All these comments don't really...shine.
What a bright pun I have made.
shame you didn't get the glowing response you hoped for
My face just lightened up seeing these puns.
True, but I'd give your comment a glowing recommendation.
You all must be pundits in the joke world...
I love Hank's shirt
"Black light" is actually a contradiction of terms. Black is what we see in the absence of light.
an oxymoron*
+gamerchunk1 that's literally the same thing.
In the video it said that black lights mostly emit UV light which is invisible to us. So it could be taken as an absence of light.
Um, something that is dark, black absorbs most of the light. You cannot say black with the word light after it as it contradicts itself.
Black is what what our brains create in the absence of visible light
A level chemistry soon and I'd like to see something on atmospheric chemistry such as the formation of radicals and what they actually are
Excelente vídeo, muchas gracias por el excelente trabajo.
As a bouncer I've also used it to detect people to get drug tested, (at places where they had a zero tolerance politic)
Small rim of white at the nostrils was a dead giveaway...
Don't forget that scorpions also glow under blacklights, making them easier to spot at night!
Why wasn't this video shot under blacklight? Fail...
He might have hair gel. Lol
Exactly!
XD
He forgot to play with a stick 😂
Mark Speir this WAS shot under a blacklight. what u see are the glow from objects that otherwise are invisible, including the presenter.
He mentions fungus; In our animal shelter, its the first way of checking an animal and diagnosing it during intake for Ringworm. While generally not such a horrible infection for people (put cream on it, slap a bandaid on, good to go) it is EXTREMELY infectious to cats (and to a far lesser extent, dogs).
Blacklights help us stop one of the worst things possible in a cat shelter (this is assuming all cats are vaccinated against other diseases, such as panluke.)
Thank you, Black light gods.
When you wear such an awesome shirt, I'm gonna notice it 15 episodes in a row! :P
What a happy surprise.
That shirt would be bitchin' under black light, Hank...
Agreed! I thought he would shine a blacklight on it before the vid ended!!
He didn’t want to expose the hank stains
Hey Hey Hey! @SciShow I GOT A QUESTION! "If you stopped eating actual food and just took vitamin supplements for say a year or 2 what would happen to your body or would you be able to even last that long?"
Thanks for doing what my boss isn't competent enough to do and teaching me how to check for counterfeit bills.
i love this show and this guy make me love science
Why am I here you ask? well, I was feeling a HANK-ering to watch scishow
Wow it took until the 8th semester of my chem degree until this topic came to light
LOL
3. Can fluorescence and phosphorescence be exhibited simultaneously from the same materials?please answer me
Why thank you!
We also use the same trick in radioactive signs, gun sights and key chains. Weak radiation from tritium gas will activate phosphors that release the energy via visible radiation, IE, light!
Did anyone else think that they were going to demonstrate with that crazy shirt that Hank was wearing?
I found best black black light is 1 or 2 on a simple shop light fixture 4 feet long or best known as F30T8BLB . Use when dark and shows how dusty or many things on surfaces you might not want to see .
I like that shirt
i was searching for how it works in the game pressure😭😭😭
I would very much like to know how long it takes for moles to appear...they keep popping up on my face and arms and hands and it's like one day they're not there and the next they are. Am I just being unobservant, or do they really poof onto my skin overnight?!
@scishow loads people claim in videos they can make black lights out of a phone torch. Although all of them have used fluorescent yellow sharpies, not the actual invisible ones. I’m trying to find out if invisible ink actually would illuminate with the right clip-on filter. Would this be possible?
I freakin love UV flashlights
I want an episode on Whirlpools and other water votrecies!
Hank would you do a video on Bohmian mechanics? Or maybe Schrödinger's wave equation?
Electron spin reversal and the science of fluorescent pigments is an interesting topic if you want to delve deeper.
Hmm for a SciShow video, I expected a little more nerdiness about the absorption and emission side of things.
Could you do one on cerebral aneurysms?
fantastic
can you make a video about Prosopagnosia (Faceblindness) ?
I would've said "magic", but I feel this is a much better explanation.
So is this UV light harmfull to people? I've been thinking about changing the lighting in my room from a normal lamp to some blacklights. Is it safe to do this? Or are there health risks involved?
i wouldnt keep the blacklights on all the time, but it should be kinda safe
What could happen if i would keep it on for hours at a time? The UV light is better in setting a mood, while watching a movie with a girl over, or even to keep on when playing games etc.
Jasper Beuls you could get cataract and go blind
I love u hanks
love it
holy crap, i looked up this video due that very same black light led zeppelin poster.
So the light absorbed by a phosphor has higher energy than the light emitted by it. What happens to that energy? Are these phosphors heating up or are they emitting other particles?
If you were in an All-White room, and you were to use a Black Light, then it would pretty much only be effective for making it dark. But if you're in the dark, and you turn it on, then basically you're just going to be sinking away into the pitch black of darkness.
Please put a link in the comments for where I can buy your shirt!
if flourescing involves converting energy from one kind into another, does it degrade the flourescing substance?
Scishow needs to do a video about Dmitry Belyev. Spread this around if you agree.(maybe it will help get their attention) If you have no idea who he is look him up. Its really interesting!
So UV-A is pretty harsh. It's the bandwidth that gets deep below the skins surface and causes cell damage. I assume this is largely mitigated by the low power of the bulb emitting it. All that said, I definitely feel like I've gotten a light sunburn when in a room filled with Blacklight for too long.
How does the sharpie challenge work?
“Checking your hotel sheets for various… fluids…” Hmmmmmmmmmm…
So I have a blacklight above my bed that I use everynight, not as a nightlight, just as a reading light type of thing. I'm wondering if this can hurt my eyes in the long run
Are phosphors the only group of compounds that glow?
and I wanted to see that shirt under UV light :D
Is black light safe? Your not supposed to look at it directly but only where it's present in the area right?
Does looking at blacklights cause vision damage like looking at a powered on lamp would?
Hank is basically just an adult, American me. That's pretty cool; I'm in some ways similar to hank!
Thanks for this video. I am not sure but I think lower frequency electromagnetic radiation has less energy so what happen to the energy loss? Is it transformed into heat as energy "loss" is often (always?) expressed? Does that mean that phosphor under UV light also emit infrared? But IR is even lower frequency than light which would mean another energy leak so now I'm confused which means I'm now so sure about my initial premise. Can someone enlighten me?
I recently got a UV flashlight and was taking it around my house seeing what glowed and didn't glow, like you do, when I tried it on a potted plant the leaves showed up as a dark red. What's with that?
So cool
@scishow
This video got me thinking about my eyes. For some reason my eyes change color from green to blue and everything in between. I swear they have actually been grey a couple of times. Do you think its from different light sources hitting my iris? Or just my genes? I would really like to know.
You probably have teal-grey eyes, in between green and blue, and depending on the light it can strengthen either the green in teal, the blue in teal or weaken them to where its grey, if you went into red-orange light it would neutralize the green-blue, etc.
Is the Fluorescing of something a chemical reaction? Does it generate heat? Does the paint or whatever breakdown? Will it stop fluorescing in the future?
Good question, I think it depends on the materials involved. Photosynthesis is related to that, and its certainly chemical. I think most of this is a change of energy form without chemical change though. Like loosening or tightening the string on a guitar. Though "glow sticks" for example and certainly a chemical reaction, and those run out of action after some hours usually. You can even boil them in water to get them to glow super bright = ) (Might want to taae precautions though as they're filled with glass which you can hear snap when you break the glass barrier between the two chemicals.)
Any possibility to get pure uv without violet light?
+SciShow I have a question: Does all electromagnetic radiation travel with 'c' or is that only for the visible light spectrum? I think it's probably all radiation but I wasn't sure because it's called 'lightspeed', which makes it sound like it only applies to visible light. Pls explain.
"Lightspeed" is just a name, everything which has no mass travels at c. I think that we call it like that because it makes it easier to understand.
Cool!
@SciShow Tree Bark video please 😊
Is it dangerous for our eyes to see it though?
So what causes the "moving light" inside the buld you can see when you look at the bulb?
Certain minerals glow under a blacklight.
+DeadLink My bed also lights up when I cumin it
Plants do this as well. Chlorophyll is fluorescent, but the emission is either quenched, too weak, or shifted out of the visible range in water.
Hold up a vial of chlorophyll extract to the sunlight, and you'll see it turn red!
Also, quinine (in tonic water) glows a beautiful cerulean blue
Orsbore my bathroom is full if minerals
Is there any substances that does the opposite of phosphorus? Emit light at a higher energy level?
Unless the substance broke down after it emitted the light, no. That would violate conservation of energy.
What if it glowed dimmer but at a higher energy level?
***** By a higher energy level I mean a blueshifted color, the opposite of the phosphorus that redshifts the color (lower energy level)
I was about to say "Anything black" before I read the 2nd sentence. Thats an interesting question.
what camera did you used to film this video? and what lens?
can you get burned from blacklights? like a sunburn?
would've wanted to see more physics about this.. absorption and "conversion" to larger wavelengths..?
2. What is the difference between fluorescence and emission?please answer me
OMG THANKS
I learned this hack several months ago where 3 layers of tape--the first two colored blur in sharpie and the last purple--can achieve the same effect a black light does, causing phosphorous material to glow. why is that?
"...which means you can use black light to check for counterfitting."
_This_ is good to know.
No mention of 1920's Depression glass? Seriously, shit guys! That is the coolest black light effect. Actual radiation emitting from glassware. I got a few at home under a black light. That green glow is lovely.
i like to randomly pause the video and see what Hank's face looks like, some moment are funny
HEY GUYS! IF SOMEONE CAN ANSWER THIS QUESTION I WOULD BE EXTREMELY GLAD. okay here it is: if phosphor can absorb the black light and then transmit it at a lower frequency, where does the energy of the black light go? I think it heats the phosphor a little bit but im not sure.
It radiates outward?