Larry Kraus wrote:
As I recall, he
colored his epoxy black, while I'm looking for a dark reddish brown.
Anybody have any experience with this or an alternative method?

Yup.

I find that black works best, as counter-intuitive as it seems. Other
colors seem to end up looking un-natural after the entire finishing
process is completed. I've used everything from universal tints, to
kiddie tempera, to artists acrylics to tint the epoxy.

Try it on some scrap and see.

Don't forget to scrape or plane the hardened epoxy, as opposed to
sanding it off, for better results.

Barry