I couldn’t resist making my own pigment ink waterbrushes, because I had waterbrushes to spare. From left to right: a Sakura waterbrush filled with highly diluted Platinum Carbon Black; Pentel Aquash with Platinum Pigment ink in Sepia; Pentel Aquash with water; mini Pentel Aquash; and the Pentel Aquash watercolor brush I previously reviewed. This quick …