Thanks, Elizabeth!
Okay, so I do have some Gaffer frit single colors and now I won't be afraid to use them with Uroboros and Spectrum 96. I have the Purpura from ThatFritGirl and an old jar of G-11 (Amethyst). Also a garnet color and Chalcedony.
Here is a bad combination that cracks with tiny crazing all over the beads, so don't ever combine these two: Bullseye Neo Lavender Opal and Gaffer G-11 Amethyst.