OK, so I have some odd results. One of the blocks floated up. I suspect that because of the hot glue I used to seal the inside of the mold the block didn't set down far enough for the hot glue I put on the bottom to actually take hold. The block was wedged in but floated up before the epoxy had a chance to cure.
The other one shows a bit of oddity in one end that I don't quite understand.
And here's the good one taken out of the mold.
Those big "swirls" at the bottom worry me because they look like they could be voids.
Turns out they are not. However, I am very disappointed in the very minimal uptake of color into the blank
Clearly I should not have relied on my memory to recall the process for double dying these.
I did set it in a pan of juice and it eventually sank to the bottom. It looked from the side like it had soaked most of the way through. In fact I was worried that there wasn't room for the other color at all.
So after having it set in the dyed juice overnight I baked it, then put it in juice dyed green the other way up. And I don't see any green in this at all.
I don't know if I didn't let it soak enough, if juice wicked into the wood but the dye didn't, not really sure what happened here.
On the good side it appears that using alcohol ink worked very well for coloring the epoxy and the mica flakes I found look pretty good as well. That last picture is just a quick 120 sand on a bandsaw cut with a bit of olive oil on the surface.