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Gumitisak

Primavera - Robert Demachy, 1899.
Alternativni
fotografski postupci

Gumitisak je fotografska tehnika 19. stoljeća, bazirana na svijetloosjetljivosti spojeva šesterovalentnog kroma,u pravilu je korišten kalij ili nešto rjeđe amonijev bikromat. Razlikujemo jednostavan gumitisak i višebojni gumitisak. Osim kalijevog ili amonijevog bikromata sastavni su dio emulzije i gumiarabika, te neki pigment, zavisno o boji koju želimo dobiti na slici.

Povijest

Smatra se da je tehniku otkrio Francuz Louis-Alphonse Poitevin 1855. Vrhunac primjene ove tehnike je na prijelazu 19. u 20. stoljeće, a najznačajniji fotograf koji je ovu tehniku koristio je Francuz Robert Demachy.

Alternative uporabi kalijevog bikromata

Kako je kalijev bikromat toksičan i kancerogen spoj, sve više se koristi nekoliko alternativnih postupaka, od kojih je najstariji korištenje soli željeza, postupak zasnovan na uporabi biljnih bjelančevina, te komercijalni proizvod PrintMakers Friend.[1][2][3]

Izvori

  1. ↑ https://johnbrewerphotography.com/blog/2024/7/24/pmf-print-makers-friend Pristupljeno 16. lipnja 2025.
  2. ↑ https://www.alternativeprocesses.org/post/the-chiba-system-a-safer-way-to-print-with-gum
  3. ↑ https://www.alternativephotography.com/plant-proteins-gum-bichromate-alternative/

Dodatna literatura

  • Maskell, A.; Demachy, R. Procédé à la gomme bichromatée, ou Photo-aquateinte, París 1905.
  • Crawford, W.; The Keepers of Light, New York 1979.
  • Scopick, D.; The Gum Bichromate Book, Stoneham 1991.

Vanjske poveznice

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