collodion negative: the hats

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  • เผยแพร่เมื่อ 18 ธ.ค. 2024

ความคิดเห็น • 17

  • @Nagy_Krisztian
    @Nagy_Krisztian 7 ปีที่แล้ว

    Veri nice work, Giorgio! I have to learn this procedure.

  • @kpkndusa
    @kpkndusa 5 ปีที่แล้ว

    Ahhhh....yes. Stravinsky. Good choice.

  • @cq68
    @cq68 6 ปีที่แล้ว

    Hello there and greeting from Costa Rica...
    I have a question, why at the second silver bath, the image is not turning totally black?
    All the rest is ok, according to the book: the copper sulfate and the potassium bromide 50/50 , the second silver bath a bit extra acid... some black appears, but nothing I call decent...
    thanks in advance
    Carlos

    • @giorgiobordin7779
      @giorgiobordin7779  6 ปีที่แล้ว +1

      Hi Carlos. I beg your pardon, but I've not understood the question. "nothing I call decent" refers to what? Something in your experience or in the actual clip? Moreover, in the second silver bath a process of proportional intensification of the previous silver deposit happens, so - luckily - the image turns black with the same gradation of the density of the preexisting silver deposit (which has been bleached bu never disappeared): the bromide fixes in proportion to the silver, recreate silver bromide, prone to make further silver precipitate in the second bath. Density is so heavy in this process that usually only albumen print or salted paper can be used to print, because no other techniques fit the extreme DR of this kind of negatives. I hope I helps.

    • @cq68
      @cq68 6 ปีที่แล้ว

      Giorgio Bordin my results are not decent, that’s what I meat (yours are impressive)
      My initial bath is at 9% and I have triple the exposure and dilute 1:1 my developer and increase dev time to 60 sec.
      The bleach goes perfect, but at the second silver bath (at 6%) not all the image turns black

    • @giorgiobordin7779
      @giorgiobordin7779  6 ปีที่แล้ว

      I think it depends on how much lasts the washing step. If you wash too much the bromide is lost. If you wash too less the intensification is uneven and patchy. Stay in a range of 45 seconds.

    • @giorgiobordin7779
      @giorgiobordin7779  6 ปีที่แล้ว

      look here also: th-cam.com/video/-qwxUb0zTIA/w-d-xo.html

  • @rariola8883
    @rariola8883 ปีที่แล้ว

    hi, great video. whats the role of nitric acid. i cant seem to get it here in my country but ive got all the other ingredients to intensify a plate. can you think if any other alternatives or substitute for nitric acid? thanks

    • @giorgiobordin7779
      @giorgiobordin7779  ปีที่แล้ว +1

      nitric acid has the role of lowering the pH. Acetic acid can perhaps be used. However, since you use silver nitrate, nitric acid is the better choice. Furthermore, is the one traditionally employed since the XX century, at least according to old books. But you can give a try. Let me know.

    • @rariola8883
      @rariola8883 ปีที่แล้ว

      @@giorgiobordin7779 thanks for the reply. i do have glacial acetic acid. i read somewhere that nitric acid helps with the flow and prevent streaking on the plate when intensified. i will try. thanks again

  • @lucaspennato5616
    @lucaspennato5616 6 ปีที่แล้ว

    Ciao Giorgio,
    avevo letto il procedimento di intensificazione nel tuo libro "Fascino e rigore del collodio", e ora ho trovato anche questo prezioso video.
    Ho una domanda, spero che potrai rispondermi. Ho a disposizione il Bromuro di Cadmio e il Bromuro di ammonio, potrei usarli per sostituirlo al Bromuro di Potassio?
    La formula che uso per il collodio è il New Guy.
    Grazie per l'aiuto che potrai darmi.

    • @giorgiobordin7779
      @giorgiobordin7779  6 ปีที่แล้ว

      non lo so. Io ho sempre usato il KBr. Mai fatto esperimenti. Però è interessante. In teoria dovrebbe essere solo necessario del Bromo disponibile, che viene di certo anche da altri sali, purché solubili. Potresti fare una lastrina piccola, meglio un paio e poi provare con l'uno e con l'altro. In questi giorno sono sommerso di cose e non posso promettere di trovare il tempo per farlo io. Ho l'impressione che i rapporti molari dei composti non siano troppo determinanti, per cui mi muoverei con le stesse percentuali di diluizione (altrimenti occorre fare il calcolo della molarlità e aggiustare le diluizioni).

    • @lucaspennato5616
      @lucaspennato5616 6 ปีที่แล้ว

      Grazie Giorgio!
      Ancora non ho provato, appena trovo il solfato di rame faccio volentieri una prova. Sai se va bene qualsiasi tipo di solfato di rame, o ne occorre uno in particolare? Scusami per l'ignoranza...

  • @miroslavarbutina767
    @miroslavarbutina767 7 ปีที่แล้ว

    Hy Giorgio! How much you put copper sulphate and potassium bromide in one liter of water.

    • @giorgiobordin7779
      @giorgiobordin7779  7 ปีที่แล้ว

      80 g copper sulphate to make 400 ml with distilled water, and 40 g of Potassium Bromide to make 400 ml. Mix 1:1 just before treating the plate.

    • @miroslavarbutina767
      @miroslavarbutina767 7 ปีที่แล้ว

      Tnx Giorgio!

  • @lucaspennato5616
    @lucaspennato5616 6 ปีที่แล้ว

    Ciao Giorgio,
    avevo letto il procedimento di intensificazione nel tuo libro "Fascino e rigore del collodio", e ora ho trovato anche questo prezioso video.
    Ho una domanda, spero che potrai rispondermi. Ho a disposizione il Bromuro di Cadmio, potrebbe essere sostituito al Bromuro di Potassio?
    Grazie per l'aiuto che potrai darmi.