Many watercolourists don’t have black paint on their palette – they mix the blacks and neutral grays from other colors as needed. Thus the “muddy effect” of black pigment can be avoided, and black is built by using watercolors’ mixing and transparency properties.

In gum printing the colors are formed and mixed much like in watercolor painting. So I decided to try printing my test negative without any black layers. This time the pigments were Linel brand, made by Lefranc & Bourgeois. Stock pigments were made as follows:

Hortensia Blue 1 g + gum arabic 4 ml
Ruby Red 1 g + gum arabic 3 ml
Helios Yellow 1 g + gum aracic 3 ml

linel_gum-1.jpg Below are all six layers with the Linel pigments. The negative was the same as in the previous test print.
1: Hortensia Blue Stock 5 ml + dichr. 5 ml, exp. 12 min., dev. 50 min.
 
linel_gum-2.jpg
linel_gum-3.jpg
+2: Ruby Red Stock 4 ml + gum 1 ml + dichr. 5 ml, exp. 8 min., dev. 60 min.
+3: Helios Yellow Stock 3 ml + gum 1 ml + dichr. 4 ml, exp. 14 min., dev. 30 min.
linel_gum-4.jpg
linel_gum-5.jpg
+4: Ruby Red Stock 2,5 ml + gum 2,5 ml + dichr. 5 ml, exp. 22 min., dev. 40 min.
+5: Hortensia Blue Stock 2 ml + gum 4 ml + dichr. 6 ml, exp. 11 min., dev. 30 min.


linel_gum-6-sml.jpg
Jalo Porkkala: In Times Past, gum bichromate print.

+6: Helios Yellow Stock 2 ml + gum 9 ml + dichr. 9 ml, exp. 33 min., dev. 30 min.
This is the finished print, with all six layers printed.