The humble Walnut has one of the highest concentrations of tannins in the natural world and has been used for many centuries to produce inks and dyes.
Some of Rembrandts and Da Vinci's drawings were thought to be made with Walnut based ink and it was even used as a hair dye in ancient Rome! To the paint...
In masstone unsurprisingly it is a dark brown, it has good transparency and displays a colourful warmth when spread thinly similar to a very rich and warm raw umber.
It has good tinting power and makes a range of almost pinkish, brown tints. I was surprised how much colour there was in the tints made with white and the beauty of them, they have a shifting quality, hard to pin down. Colourful, warm, greys would be the best description.
Pigment - Walnut derived
Vehicle - Linseed Oil
Opacity - Transparent
Tint Power - Medium