Posted by Jeff on February 03, 2010 at 15:26:35:
In Reply to: Chemical Concentration for Etchant posted by Robert Tang on February 03, 2010 at 06:38:12:
You might be interested in reading the section about Preparation and Handling of Etchants in ASM Metals Handbook Volume 9 Metallography and Microstructures, ASM International, 2004, ISBN 0-87170-706-3, pages 308-310. I think it will answer many of your questions.