/diy/ - Do It Yourself

>>710545
Close up picture of the "grain" of sorts.
The etchant forms a big puce-yellow bubble, which engulfs the aluminum, I suppose it's a chemical reaction. It produces some really nasty gas, don't breathe it. But it also soaks on the aluminum for a some time, depositing the copper that I have etched away with it previously back onto the aluminum, most noticeable on the screws.