Here is a general usage for which you are askiing.
The etching solutions generally used are hydrochlo-
ric acid, ammonium persulfate, iodine and potassium
iodide, or nitric acid. Each solution highlights different
defects and areas of the weld. The hydrochloric acid
dissolves slag inclusions and enlarges gas pockets,
while nitric acid is used to show the refined zone as well
as the metal zone.
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Dont get on to the roundabout if you dont know how to get off
Acid etching.
