Gum-Bichromate

Here are a few examples of my first tries to make prints with the gum-bichromate process https://en.wikipedia.org/wiki/Gum_bichromate

Following method was used:

Paper, shrinked and sized with gelatin; hardened with 1% formalin solution.

Gum arabic solution 30% 3 ml
Potassium dichromate solution (13-14%) 3 ml
about 0.5 g watercolor dye from Lukas
Yellow (1021), Magenta (1051), Cyan (1118)

Drying time: 20 min with fan blowing cold air at paper

Exposure: 12 min with UV 365 nm

Wash: 40 min and later slightly brushed with a soft brush to remove non hardened gum.

Pictures:

Leaves:
My first try....put same dry leaves on a scanner, scanned it, made a color separation, printed the three negatives at a laser printer...and printed it



Girl, the second try...
Picture is is from the Internet (public domain) the size was 14 MB...Negatives where printed at a laser printer, too



The hard lesson:
Picture is from this source:
http://www.wikiart.org/en/william-adolphe-bouguereau/the-har...
Color-separation was made with Adobe CS5 and the negatives where printed with a Epson SureColor P600 at Pictorico PRO OHP Transparency Film.
Size is DIN A3
Water colors where:
a) 484 Phthalo Blue Schmincke Watercolour
b) 208 Aureolin Modern Schmincke Watercolour
c) 351 Ruby Red Schmincke Watercolour

Exposure 8 min
Wash: 1 - 2 h