Daler-Rowney Pro Black and Pro White
Source: http://www.jerrysartarama.com License: All Rights Reserved.
Pro White and Pro Black by Daler-Rowney are “very opaque, water-based inks for use on paper, negatives, acetate, and other art material surfaces.” The big ‘P’ is taken from Motter Ombra — here with slightly bumpy curves.
