For chemical etching

Klemm solution or 

The mixture : 

100-120 ml of water ou ethanol

20-50 ml of HCl

5-10 g of Ferric chloride (Fe III)

tks, Atli

For electrolytic polishing of pure copper:

80 ml H3PO4 + 20 ml H20 (2 distilled water)

U~12 V, J~0.4-1 A

Tks, Khisamov. Another question is what degree of temperature is carried out for this electrolytic polishing. thank you for ur reply in advance.

at room temperature