, resin should also be able to be colored with artists' oil paints --the kinds in tubes at the craft store; some even come in kits of colors in small tubes so you can also mix new colors before adding to the part-A resin as well as mixing colored part-A's together.
(Don't use the artists' quality acrylic
paints in tubes though.)
Since oil paints are transparent, if you ever want an opaque colorant for the resin you can often just add a bit of titanium white too which is always opaque.**
There's more info on coloring resins in various ways on this page of my site, if you're interested: http://www.glassattic.com/polymer/other_materials.htm
...click on Coloring + Inclusions + Fauxs
, under Epoxy Resins
(...also click on Colorants
under Polyester Resins
if you're using a polyester resin instead of an epoxy)
might not stay really black if any white at all were added though, but you could do a last (will be bottom
) layer of dark gray (white + black) if using a mold, then just use the plain semi-transparent black for the rest of the resin for the same kind of effect.
If pouring into a permanent cell though, the opaque layer should be done first instead of last.