Grumbacher Tips & Techniques - Some mistakes can be lifted by sponging with clean water and blotting; however, some "staining" pigments can't be entirely removed. Chartpak Inc. is affiliated with Thalo, LLC
Materials and Methods Matter: Charcoal Drawing Techniques
Materials and Methods Matter: Introduction to Inks and Paper
Dr. Randall Feingold
TICO TORRES
DANIEL STERN
TODD WHITE