Homebrew PCBs

grantfair2001 wrote:
> 
> A short PS to my last poat. When I started using this etchant in May
> 2003 the SG was 1.245; as noted last post it is now 1.262.
> 
> Gramt

Thanks for the info. Its just that I've seen wide variations in etch 
performance with this etchant, so I'm just trying to nut out what makes 
it work. It seems S.G > 1.30 and acid > 1M. Might one day do a series of 
controlled tests. 20 minutes sounds reasonable, for your setup.