Project 6 - Pre work

by Wild Yonder

http://wildyonder.org/from-the-bunkhouse/2014/4/4/cyanotype-prints

     "Cyantypes are a contact print process and you will need a negative the same size as the size of the print you want. A cyanotype with a blue image on a white background is obtained using a negative transparency. In order to obtain a pale white image on a blue background, a positive transparency must be used. Cyanotypes are created with a simple solution of ferric ammonium citrate and potassium ferricyanide."

-from http://www.freestylephoto.biz/alternative-process/cyanotype

Learn to make cyanotypes like this here.

Photographer Unkown
Collodian Print
https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/1860_Anonyme_Un_v%C3%A9t%C3%A9ran_et_sa_femme_Ambrotype.jpg/800px
1860_Anonyme_Un_v%C3%A9t%C3%A9ran_et_sa_femme_Ambrotype.jpg

"The process involved adding a soluble iodide to a solution of collodion (cellulose nitrate) and coating a glass plate with the mixture. In the darkroom the plate was immersed in a solution of silver nitrate to form silver iodide. The plate, still wet, was exposed in the camera. It was then developed by pouring a solution of pyrogallic acid over it and was fixed with a strong solution of sodium thiosulfate, for which potassium cyanide was later substituted. Immediate developing and fixing were necessary because, after the collodion film had dried, it became waterproof and the reagent solutions could not penetrate it."
- from http://www.britannica.com/technology/wet-collodion-process
Learn to make collodian prints here.

Charles Guiren

Gum Bichromate

              "Gum bichromate, or gum dichromate as it is also known, is a photographic printing process invented in the early days of photography when, in 1839, Mungo Ponton discovered that dichromates are light sensitive. William Henry Fox Talbot later found that colloids such as gelatin and gum Arabic became insoluble in water after exposure to light. Alphonse Poitevin added carbon pigment to the colloids in 1855, creating the first carbon print. In 1858, John Pouncy used colored pigment with gum arabic to create the first color images. Gum prints tend to be multi-layered images sometimes combined with other alternative process printing methods such as cyanotype and platinotype. A heavy weight cotton watercolor or printmaking paper that can withstand repeated and extended soakings is best. Each layer of pigment is individually coated, registered, exposed and washed. Separation negatives of cyan, magenta, and yellow or red, green, and blue are used for a full-color image."

-from https://en.wikipedia.org/wiki/Gum_bichromate

Learn how to make a gum bichromate here.

Original artwork using brushes.