I think the Chrome effect came from a sort of Vapor deposition when the one rock exploded, and a fragment of something landed on the red hot coils and turned to vapor maybe and settled on the red hot rocks. Maybe something similar but just from fumes released from inside the rock when it got up to temp? That is the best I can come up with.
Fabulous, I do love your experiments but must admit some of them are hilarious, not sure if it’s the results or your commentary! Thanks anyway, great stuff, keep them coming.
I do pottery and glass fusing, I've made my own molds with refractory mortar, silica and plaster. You should coat your molds with 3 coats of boron nitride spray, drying between each layer. It's like $60 a can but worth it. I would check out Mark Lauckner on TH-cam he experiments with glass, his Patreon channel is interesting to look at as well. I have 753 glaze tests I've tried and 501 currently with glass. I have my own "experimental" lab here in my basement, I should probably put it on TH-cam. This week I've been experimenting mixing a diy recipe for Spectrum Raised Accents and mixing it with fused glass, the tests are very successful so far : )
It is likely there was carbon-containing organic material in your backyard clay release agent which would reduce silicon dioxide in the rocks to a thin layer of silicon metal or silicon carbide on the surface. The high temps and confinement at the bottom of the kiln is a good environment for a carbothermic reduction reaction.
Great fun....thanks for sharing. It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or weathering.
interestingly there is evidence that at least by the neolythic farmers and hunters started hardening softer rocks in kilns to then utlise as spearpoints, tools, etc
really looks like obsidian ! it would be verry typical for it to break in such sharp shards and has a pretty low melting temp. but verry cool experiment !!! i think you could try pure kaolin as releasing agent, should be brittel enough to break away easy. probaply the best but also most expensive realsing agent would be bornitrid .. as powder or spraycoating .
The chrome like effect reminds me of haematite like rocks. Perhaps it is it exactly that, formed during the melting process? As for the release agent... In our school one of our teachers makes a sort of makeshift kiln furniture by firing a layer of molochite/mullite powder into a semi solid somewhat porous layer which she then breaks and puts under cups during glaze firing. I'm thinking that could possibly be porous and fluffy enough to also dampen the blows when trying to release the monkey
I think you partially made a flint knapping video. Alumina hydrate is the best release I can think of. Wood fire potters use it in their wadding, and it comes off fairly well, even with the atmospheric desposits. I also wonder if powdered silicon carbide might work? The Advancer shelves are made from it, and they are extremely heat resistant, and glaze drips release relatively easy from them. The appearance of some of those, looks like a commercial glaze called "Old Pewter".
As others have said I would suggest powdering the scraps of the rock and do 4 tests where you mix it with either glass cullet, frit, or dry clear glaze, and then you have a final "control" test with just the powdered stone. For the mold release what I was taught to use for glass casting is boron nitride spray. Also as I have said on another of your videos you can use a high amount of frit 3124 (or gerst borate) and black copper oxide [with tiny bit of bentonite] to get that graphite/chrome look at cone 5/6
Fun times... makes me think about the difference between basaltic volcanoes (think Hawaii, middle of the ocean) and granitic volcanoes (continental, Mt St Helens) and how the granitic ones tend to explode because of the water incorporated into the chemical makeup of the stone vaporizing when the magma/lava is depressurized. Banding tends to be a sign that you're dealing with a sedimentary rock, and anywhere that sedimentary rocks can form, is going to have granitic material. It's fun to imagine what kind of environment these rocks formed in. With bands of alternating sedimentary and glassy igneous material, perhaps it formed on the surface in an area with the occasional volcanic eruption depositing material onto a stream bed where sediment from erosion was already being deposited.
Hey Justin, is old glaze worth anything? I found a bucket of pint jars of glaze from the 40s - 60s in my grandmother's stuff. It's all dried out but looks okay.
i am no expert, but I would argue that you would have better results right of the bat if you were to smash the rocks to really thin gravel (concassé) maybe even until it is closer to sand
Nothing noteworthy on the firing. I fire two different cone 5 schedules, one with a 100 deg. temp drop and hold after peak, and one with a free-fall cooling. I've used both and haven't seen a difference when it comes to rocks.
First of all, I think you should use gloves. For a release agent, alumina hyrdate is probably the way to go, you could make kiln wash with 1 part alumina hydrate and one part kaolin. You could try mixing in zincronium dioxide or titanium dioxide, they are both very refractive.
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I did not expect such great results... thanks for sharing.
I was surprised on all levels. Thanks!
I think the Chrome effect came from a sort of Vapor deposition when the one rock exploded, and a fragment of something landed on the red hot coils and turned to vapor maybe and settled on the red hot rocks. Maybe something similar but just from fumes released from inside the rock when it got up to temp? That is the best I can come up with.
Fabulous, I do love your experiments but must admit some of them are hilarious, not sure if it’s the results or your commentary! Thanks anyway, great stuff, keep them coming.
I do pottery and glass fusing, I've made my own molds with refractory mortar, silica and plaster. You should coat your molds with 3 coats of boron nitride spray, drying between each layer. It's like $60 a can but worth it. I would check out Mark Lauckner on TH-cam he experiments with glass, his Patreon channel is interesting to look at as well. I have 753 glaze tests I've tried and 501 currently with glass. I have my own "experimental" lab here in my basement, I should probably put it on TH-cam. This week I've been experimenting mixing a diy recipe for Spectrum Raised Accents and mixing it with fused glass, the tests are very successful so far : )
always great discoveries on your channel. keep it up :)
I love your videos. You do the neatest things.
It is likely there was carbon-containing organic material in your backyard clay release agent which would reduce silicon dioxide in the rocks to a thin layer of silicon metal or silicon carbide on the surface. The high temps and confinement at the bottom of the kiln is a good environment for a carbothermic reduction reaction.
Great fun....thanks for sharing.
It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or weathering.
Interesting! Thanks
melting lava rocks - as hard as it gets!
you use kiln wash in glass slump molds, which is basically this, so that is what I would try.
That is a really good point! Now I wonder why slumped glass doesn't have wash stuck to it. Going to have to look into this.
interestingly there is evidence that at least by the neolythic farmers and hunters started hardening softer rocks in kilns to then utlise as spearpoints, tools, etc
Are you sure that’s “rock” and not glass or obsidian? I really enjoy your experiments - thanks for sharing!
He who has not sinned cast the first stone.
really looks like obsidian ! it would be verry typical for it to break in such sharp shards and has a pretty low melting temp. but verry cool experiment !!! i think you could try pure kaolin as releasing agent, should be brittel enough to break away easy. probaply the best but also most expensive realsing agent would be bornitrid .. as powder or spraycoating .
The chrome like effect reminds me of haematite like rocks. Perhaps it is it exactly that, formed during the melting process?
As for the release agent... In our school one of our teachers makes a sort of makeshift kiln furniture by firing a layer of molochite/mullite powder into a semi solid somewhat porous layer which she then breaks and puts under cups during glaze firing. I'm thinking that could possibly be porous and fluffy enough to also dampen the blows when trying to release the monkey
I think you partially made a flint knapping video.
Alumina hydrate is the best release I can think of. Wood fire potters use it in their wadding, and it comes off fairly well, even with the atmospheric desposits.
I also wonder if powdered silicon carbide might work? The Advancer shelves are made from it, and they are extremely heat resistant, and glaze drips release relatively easy from them.
The appearance of some of those, looks like a commercial glaze called "Old Pewter".
As others have said I would suggest powdering the scraps of the rock and do 4 tests where you mix it with either glass cullet, frit, or dry clear glaze, and then you have a final "control" test with just the powdered stone. For the mold release what I was taught to use for glass casting is boron nitride spray. Also as I have said on another of your videos you can use a high amount of frit 3124 (or gerst borate) and black copper oxide [with tiny bit of bentonite] to get that graphite/chrome look at cone 5/6
Thanks for the great tips! Boron Nitride spray is a really interesting idea. I will have to try the f3124/copper oxide combo too.
Fun times... makes me think about the difference between basaltic volcanoes (think Hawaii, middle of the ocean) and granitic volcanoes (continental, Mt St Helens) and how the granitic ones tend to explode because of the water incorporated into the chemical makeup of the stone vaporizing when the magma/lava is depressurized. Banding tends to be a sign that you're dealing with a sedimentary rock, and anywhere that sedimentary rocks can form, is going to have granitic material. It's fun to imagine what kind of environment these rocks formed in. With bands of alternating sedimentary and glassy igneous material, perhaps it formed on the surface in an area with the occasional volcanic eruption depositing material onto a stream bed where sediment from erosion was already being deposited.
Nice! Mybe crush de rock to small bits and wash it with vineger or some acid afterwards..
I believe you have obsidian. It melts at around 1650 degrees F. Very cool experiment! 👍🏼
thumbs up for channel support :)
Ooooo we might get a real monkey.
Hey Justin, is old glaze worth anything? I found a bucket of pint jars of glaze from the 40s - 60s in my grandmother's stuff. It's all dried out but looks okay.
I wouldn't think it had any monetary value, but it wouldn't be hard to add water to them. I'm sure they would work.
i am no expert, but I would argue that you would have better results right of the bat if you were to smash the rocks to really thin gravel (concassé) maybe even until it is closer to sand
Justin could you comment on the program you use to do this rock firing? I'm going to play with this today :D
Nothing noteworthy on the firing. I fire two different cone 5 schedules, one with a 100 deg. temp drop and hold after peak, and one with a free-fall cooling. I've used both and haven't seen a difference when it comes to rocks.
What temperature do you fire to?
Cone 5. About 2,150F.
9:40 F r e e h i m
First of all, I think you should use gloves. For a release agent, alumina hyrdate is probably the way to go, you could make kiln wash with 1 part alumina hydrate and one part kaolin. You could try mixing in zincronium dioxide or titanium dioxide, they are both very refractive.
The fired rock patina looks just like the carvings on temples in India that are some are questioning if they are melted and molded rock.