FOUR TECHNICAL ARTICLES ON AQUATINT ETCHING
These aquatint articles are written for printmakers and assume basic knowedge of etching. They were originally printed in The California Printmaker, the newsletter of The California Society of Printmakers (web site)
MORE ROSIN (the basics of doing an aquatint)
MULTIPLE PLATE AQUATINT (how to create multiplate aquatints) 
CREEP-ETCH (how to do creep-etches)
DRAWING MULTIPLE PLATE AQUATINTS (Updated multi-plate article)