For a while now I've been using felt tip "metallic marker" pens for
contrasty marking over black IC bodies.
UK/ASDA own brand silver-colour and gold-colour work very well, but like all
these they are broad tip only , so its a matter of sharpening the tip with a
razor blade and using the very lightest of writing force.
I've also been using them to write gains , test date etc on the bakelite
skirts of valves/tubes.
Today I wondered if they would survive hot glass envelopes of valves in
use,.
Tried marking some glass with the silver and gold and also a black permanent
CD marker pen. Taking to 220 degree C the metallics surtvived fione but the
CD marking degraded easily. Will have to see about long term use but worth a
try


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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/