Saturday, March 1, 2008

Gum Bichromate Testing #1


Printing the Adobe Olé black and white test neg today. Pigment load 0.2 grams Payne's Grey in 2.5 ml gum arabic and 2.5 ml potassium bichromate. The mix is enough to make two 7x9 images on Arches Aquarelle paper. Mixing the emulsion to ensure consistency because I think past problems have arisen because of not taking enough care. Poor mixing leads to splotchy emulsion. Coating evenly is a major technique to learn.

Exposures: 5 minutes and 4 minutes.

Also tried a new approach to development using two water baths. The first water bath for about 10 minutes and the second for about five minutes seems to fully develop the image. Used the same water for both prints.

1 comment:

Cait said...

This is an interesting technique!