===Etching===
(The etching solution is a 200g/L ammonium persulfate mix. The etching process can take to be completedover an hour. To speed up this shit, you can add heat and/or bubbles to the solution. The solution should take a blue to deep blue hue. The reaction is (NH_4)_2 S_ 2 O_8 -> CuSO4 + (NH4)_2 SO. The resultant liquid is less harmful than ferric chloride but should still be treated with other chemical waste
== Safety ==
