Once again, I sanded the surface before doing a toner-based heat transfer to the sample.
The transfer went pretty well. I didn't worry about getting the transfer past the point where I could see everything well enough to carve it. I think the contrast on this color is much better than it was on the gray sample.
I did my first test print with my cheapest dye ink on a fairly porous piece of scrap paper - I didn't think of it at the time, since I was sort of focused on the carving part of the process, but I should have used the same paper I sent out to all the testers. D'oh! So, the ink coverage wasn't great, but that's not what I was looking for at this point in the process. I wanted to see if the letters looked clean or ragged. They looked pretty clean.
I found that the fresh, sharp Testor's knife carved through the sample very nicely with good control in little corners and interior spaces, as well as 's' curves and other areas that can be challenging for me. I also tested the block with a well used, dull knife that I had sitting on my table and it didn't carve nearly as well as it did with the sharp one. I discarded that knife as a tool pretty quickly. So, for me, the sharpness of the blade made a clear difference.
Another test print on another scrap with the same dye ink. Even unmounted, I didn't have any trouble with stray carving marks being printed where I didn't want them, so the material was firm enough to withstand a decent amount of pressure.
Here's the final print on the nicer index paper using Brilliance pigment ink. I mounted the carving on a small acrylic block For size reference, the acrylic mount is one by three inches.
The sample was sent to me curled up in a tube, so there was a bit of concavity to the carving surface. It didn't bother me while carving at all, but it might have been a problem for printing, without the acrylic mount - of course, an eighth inch is still too thin for me to manage without a mount anyway, so I'd have had trouble in either case. If my tester results come back positive enough and I decide to have a run of this material made, I'll have to make sure that it comes out flat.