Try printing with colors other than those specified.
The Salix iron gall ink is first slightly blue and then becomes darker.
Visually, the process is somewhat reminiscent of the development process of analog photo prints.
Inkjet print on Boesner Academy 160g/m² A4 drawing paper.
Picture 2 as picture 1, but with additional Epson 104 Dye ink layer.
All photographs from Iceland. Hofsstadaskogur and lava field Snæfellsnes peninsula.