Stefan Trethan wrote:
>
> (is my assumption correct that i need to dissolve 200gram copper to raise
> the density by 0,2?
> in a 1l container...)
>
> I'll try to get more copper in, and i also decided i need some of these
> eyedropper bottles.
> then i can keep one filled with 1mol NaOH and use the other (equal-sized)
> eyedropper for the etchant.
>
Also add some hydrometers to your shopping list to cover the
range 1.00 to 1.30 I find hydrometers with 0.10 range are plenty
good. Standard laboratory hydrometers have a range of 0.05.
Looking at the commercial CuCl etchant (
http://www.oxfordvue.com/TechInfo/how_does_it_work.html ), they
run at s.g 1.35 to 1.4 and have about 220 g/liter of copper.
I think this is too high, I found 1.25 to 1.30 better for room
temp etching. CuCl2 etching without chemical oxidizers (H2O2,
Cl2, NaClO3 etc) should etch 35um copper foil in 20 minutes at
20°C with bubble agitation. Keep HCl plentiful.