For the borders we used:
Green - terra verde - zinc white nr 2 (Bertrik made a series of shells starting with pure terra verde and adding zinc white with little bits at a time. So this is the shell with two little bits of white added. Very scientific :)).
Blue - ultramarine
Red - permanent red
For the black outlines and squiggles I'm using a Staedtler pigment liner 0.1, after experimenting a bit with metal pens.
For the gold we're using the most simple gesso made with gum arabic with icing sugar (poedersuiker) and a little red bolus pigment.
