Now that I have some test cuttlefish with this new clay blend I needed to test just how translucent it really is. I'm very pleased with the results. Here's a photo of the cuttlefish pendant held up to a candle.
I eyeball amounts when mixing clay so this isn't exact but the mix is basically 1/4 of a 2oz package of premo frost, a pea size ball of white premo, a smidgen of blue premo (maybe 1/6 of the size of the ball of white). You want to add just enough white and blue to make the premo frost look whiter, it's normal color is a little beige or cream colored but much less so than normal translucent premo.
Next up is painting these cuttlefish. I need to be very careful to only slightly tint them with paint and pearlex, I don't want to hide the translucency at all. I'll probably wait until after my new beads arrive to start painting because I want to be able to compliment the bead colors nicely.