This topic has 1 reply, 2 voices, and was last updated 2 years, 11 months ago by susanmbarnes. Author Posts August 9, 2018 at 7:40 pm #18410 ken79Participant What do the letters after the paint colors in the tutorial mean August 17, 2018 at 6:13 pm #18534 susanmbarnesParticipant HI Ken, Do you mean the “S” or “A” letters? If so, S stands for student grade, that is, Cotman paint by Winsor and Newton. The A stands for Artist grade, also Winsor and Newton Artist grade paint. I hope that answers your question. Sue B Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.