January 2009

Monthly Archive

After a Hotter Look

Posted by on 06 Jan 2009 | Tagged as: Gum Bichromate

The next logical step would probably be so-called full color gum printing – making three or four color separation negative set and printing with pigments resembling (more or less) the “real” CMY(K) process colors. We’ll definitely try that too, but meanwhile, I’d like to quickly introduce another slightly different way of building up the desired tone range with the single negative technique – starting with the lightest pigments and proceeding towards the darker ones.

Printed with Maimeri powdered pigments. The first layer is Cadmium Yellow, the second one Alizarin Carmine, and the third one Prussian Blue.

Jalo Porkkala: Cupidos, gum bichromate print.

The fourth layer is another lay-down of Prussian Blue, meant to increase contrast a bit, and cool down the shadow tones.

I kinda like the tonality, although it is not quite what I had in mind; I wanted more red, somewhat hotter look – these guys obviously are a pair of nasty cupids from hell after all. Maybe I´ll add a layer of fiery red one day…

Changing Pigments

Posted by on 04 Jan 2009 | Tagged as: Gum Bichromate

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.
+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.
+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.

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.