was testing two dying materials, red powder coat powder, and orange chalk line chalk.

both needed about 1/4tsp to deeply dye 10cc of clear epoxy. chalk was just a tad harder to mix in well.

the plastic powders can carry static charge into the epoxy, so for potting i would shuffle the amount needed around on a metal plate before mixing into an epoxy that is used for potting, also use a metal stick for mixing.

with two std #12awg wires taped together (1/8" between wire centers) 240vac(rms) showed zero uA.

 

Boat stores have pigments for coloring epoxy and polyester resins.

As for the static, pre-mix with a little alcohol, which is generally miscible with epoxy.

John

 

Consider using Rit fabric dye powder. Don't think it is prone to static like the poly powder coat. And should "wet" better than the chalk.
http://www.joann.com/rit-dye-powder/prd10751.html

 

so just an fyi, need to be careful with dyes in general, some colors can be metals based. i need to do some dielectric testing of Rit.

 

Most "metal" dyes will be an oxidized form of the metal (i.e., a "valence" ≥ 1 ). Some of those oxides are good insulators (e.g, aluminum); some are good conductors (e.g., lead). You will not find lead in any dye made in the USA. If it has a metal, I would not rule it out based on that alone without checking what the conductivity of that metal compound was. I suspect most Rit dyes are not based on metals.

John