David Pyle is an author, a publisher, a prize-winning watercolor painter, and he has worked in and around the art supply world for decades. He teaches at Colorado State University and also at Sketchbook Skool.  He also has a degree in Chemistry which comes in handy when it comes to explaining how pigments bond to paper.   David knows everything about everything related to art supplies, and I always learn so much from talking to him.  Get your free ebook and essays at DannysEssays.com DannysEssays.compodcast@sketchbookskool.com