I have some old circuit board etching solution (ferric chloride) that is unused but a few years old and has not been in a temperature controlled environment. It has been sitting, all but forgotten, on a shelf in my garage.
I'd like to etch some small boards this weekend, but would rather not ruin them with old chemicals.
Should I just go ahead and use it or buy some new etchant?
Best Answer
I have successfully used ferric chloride from a ten year old bottle. It was stored in my house though, not the garage.