I am trying 3 mediums: Shellac,Lacquer and Zpoxy[used in finishing guitars], and coloring/tinting each with these three colorants:Universal tints,metal acid dyes[transtint],and artist oils.I have a no. of ques.'s re. compatability with each of these mediums.I have tinted epoxy with universal tints and never had a problem.The universal tints i have seen [and have on hand] are not as vibrant i.e., red isn't red it's rusty or terra cotta red.If you were to use artist oils mixed in epoxy, wouldn't they become encapsulated in the epoxy and never cure?If you could ,list the 3 finishes and give the variety of colorants you could use with each one..Scott Holmes, if your out there jump right in.As always thanks for any and all responses..Rob