I’ve been following this discussion and since the etch seems to affect certain colors,is it possible the dyes are metallic based and the etching soloution just etches these metals away ?
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Tuesday, November 15, 2016 3:30 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] GENERIC MARKER INDIA INK FABRIC PAINT ETCH TEST
So just for giggles........
I tested dollar store permanent markers brand ACADEMIX
and
here's a surprise.....
BLACK ink totally disappeared
BLUE ink faded away
but
RED and GREEN worked great!
Sound familiar?!?!?!
same thing happened with CASEMATE:
http://www.learnmorsecode.com/laminator/etch/index.html
AND
since we were talking about drafting inks I looked around here and found
INDIA INK and FABRIC PAINT
The FABRIC PAINT DEFINITELY WORKS WELL. If I had to I would use FABRIC PAINT to protect
a copper board from acid.
The INDIA INK FLAKED AWAY
unreliably leaving missing copper traces.
http://www.learnmorsecode.com/laminator/etch/testetch50.html