On 2/28/2016 11:55 PM, Stefan Trethan
stefan_trethan@... [Homebrew_PCBs] wrote:
"As far as I know Staedtler Lumocolor red is the best resist ink.
It is still available and I am not aware of any change in the formulation?"
Hello, Stefan--
Thanks for your question.
IIRC, the ink may not have been a Staedtler product. The topic arose
around the time
that HP introduced its 7470 desktop plotter (early 1980s), and various
experimenters were trying
direct-writing PC resist application. One red ink in particular proved
to work relatively well but then was
withdrawn and reformulated which degraded its performance as resist.
Maybe it's time to dig out those mothballed HP plotters and try again....
Thanks again, and 73--
Brad AA1IP