Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A classic on the subject...

This is a true classic, the first book to really cover watercolor pencils in depth. It's in my own library, and I wrote Watercolor Pencil Magic!I didn't end up using the crush up pencil tips and paint technique in my book, because it seemed like an uneccesary step in the creative process, but Greene's paintings are beautiful and inspiring!