Electro-etching = Electroetch = Galv-etch = Anodic etching = Polytypi = Electrolytic etching
Electrotint = Micro-dot = Microtint = Microtinting = Galv-tone
Websites:
Nik Semenoff: http://homepage.usask.ca/~nis715/electro.html
Marion and Omri Behr: http://www.electroetch.com
Cedric Green: http://www.greenart.info
Bibliography:
POLYTYPI by Peter Sjoblom. Sweden. 1991
GREEN PRINTS by Cedric Green. Published by Ecotech Design. France. 1998- 2004
MANUAL DEL GRABADO ELECTROLÍTICO by Alfonso Crujera. Spain. 2008
ELECTRO-ETCHING HANDBOOK - A SAFE, NON-TOXIC APPROACH by Alfonso Crujera. Spain. 2013