gEDA-user: DIY brass stencils

[John Griessen]

John Griessen wrote:
  In electro-polishing, the etchant has
> gelling properties adjusted so the effective concentration in a low area 
> or corner is less than on a high spot or straight long edge.  At first 
> everything etches at the same rate, but then the etchant trapped in 
> corners and at the bottom of the undercut gets depleted.

Reverse that last...   Gel would make the corners more round, less corner-like.
If you had enough that it slowed etching in a .5 mil radius, it might make the 
wall straighter by slowing the etching under the toner while not slowing it 
farther down from the toner edge.  The toner edge would be a projecting shelf by 
then...

John Griessen