Here is another try to achieve results similar to the previous gum test, using only three print layers.

gum-2_curve.jpg
Thought I should make another version of the negative. Here the correction curve makes it somewhat lower in contrast, compared to the previous one.

020908_gum-1.jpg020908_gum-2.jpg
The first layer (left) and the second layer on top of it. Funny how warm ivory black looks on Somerset paper…

020908_gum-3.jpg
All three overlapping layers printed.

The Process

Three stock pigments were made and used diluted for the sensitizer:
1. Maimeri Ivory Black 1 g + gum arabic (14 Baume) 20 ml
2. Maimeri Prussian Blue 1 g + gum arabic 20 ml
3. Maimeri Alizarin Carmine 1 g + gum arabic 20 ml

Coating was made with a foam brush, then evened out with a Hake brush.
Paper was Somerset 200g, preshrinked.
Sizing: Gum + dichromate + water, 1+1+1 parts, exposed 4 min. with Osram Ultra-Vitalux from one meter, washed for 60 min.

Layer 1
Pigment: 1 part Ivory Black Stock + 1 part gum + 2 parts dichromate
Exposure: 18 min.
Development: 30 min.

Layer 2
Pigment: 1 part Prussian Blue Stock + 1 part gum + 2 parts dichromate
Exposure: 6 min.
Development: 70 min.

Layer 3
Pigment: 1,5 parts Alizarin Carmine Stock + 0,5 parts gum + 2 parts dichromate
Exposure: 10 min.
Development: 24 min.

Clearing: Potassium disulfite 5% 2 min.