Thanks for posting those details.
Your experience with the SystemThree pigmented epoxy mirrors mine.
I was taken aback with the price of those pigments, but they are so concentrated that they are a good buy, IMO.
For smaller batches of epoxy, I find that just dipping the end of a clean stir stick in the jar will transfer enough pigment to do the job.
I've used those pigments for things like glass seats and hatch lids, as well as 'black' interior glassing.
And, as you say, the working properties of the epoxy aren't affected - unlike adding a powdered pigment like graphite or iron oxide.
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- Epoxy: Pigment