the downside of collecting

[Glory_Cloud]

"35% HCL Hydrochloric then dilute 1 part acid to 5 parts water"

Stu's recipe calls for HCL which is Hydrochloric acid. 35% HCL
can be found at your local hardware store. It's normally used
as a concrete cleaner and I buy it as muriatic acid.

Just please be careful with it as it burns skin, eyes, clothes, etc.
and you don't want to breathe it in great quantities just like
you don't want to breathe the gasoline fumes when pumping
petrol into your car or truck. So wear protective gloves, glasses,
old clothing when using it full strength. You know, read the fine print
on the bottle!

[Neon_WA]

what fine print

You can make it even more dilute.. just takes a bit more time

Points to keep in mind
never leave on chip than a few minutes before washing off
if solder scrapes are still there... repeat again
keep solution away from any gold plating that has bubbled from corrosion underneath
avoid solder as it will turn dark and dull with too much contact with the acid

I keep my scrap processor to try new techniques, as some are better than others depending on the issue

[susl45]

[Neon_WA]

[gshv]

ok, thanks! I didn't know the recipe was the same.

Gennadiy