You can find about these etching chemicals used in
making printed circuit boards here and download MSDS sheets for
ferric chloride: http://www.mgchemicals.com/products/415.html
A. Stated as providing a more consistent etch than Ammonium Persulfate
B. Stated as etching twice as fast than Ammonium Persulfate
C. Roughly 10-20 minute etching time.
D. Will not remove most etch resist inks.
A. Translucent liquid allows the user to see the progress of the
B. Roughly 30 minute etching time.
C. May remove some etch resist inks. Must use a compatible etch resist pen.
A. Flash point at 180 deg F. FLAMMABLE!
B. The solution is shock sensitive
C. Solution decomposes when heated.
D. Cleaner solution, allows increased visibility during etching.
E. Will not remove most etch resist ink.
F. Must be stored in a ventilated container due to gasseous nature.
Ferric chloride is cheapest- It is a byproduct of steel making (
spent pickle acid) it is a common coagulant used in municipal water
purification both for waste treatment and potable water.
for more see:
For more on etching mordants see from printmaking
sites: galvanic etching
Edenburg etch ;