whats best method for acid etching?

[Rodney Gold]

Caustic soda or diluted Ferric , full strength Ferric will go exothermic and generate a ton of heat snd cause fizzing and lift the resist. 1:3 water diluted ferric if its fresh. 1:2 dilution if its partially spent. Caustic will go thru anodising. Caustic is DANGEROUS stuff. You can also use dilute hydrochloric (pool acid). Etch ally OUTSIDE in a well ventilated place!!!!!
The KEY to etching is that the surface to be etched is VERY clean. We often lightly sandblast the item first just before etching so the etched areas get down to totally bare metal. ALWAYS have protective goggles , gloves and a dust coat if etching. You may need to brush bubbles off the surface you etching when doing so , a plastic Kitchen basting brush works well.

[Fizgig]

Thanks again Rodney,