Posted by Robert Tang on February 03, 2010 at 06:38:12:
I'm the beginner in the metallargy, i have defficulty of determine the correct chemical concentration use for the etchant. A lot of book did not specified it. The chemicals are as the following:-
a. Ammonium Nitrate
b. Phosphoric Acid
c. Sodium Thiosulfate
d. Hydrocloric Acid
e. Zephiran Chloride
f. Sodium Hydroxide
h. Cupric Chloride