The working notes say:
Opaque/Reactive - but the package says "Transparent." Deep, shimmering green with specks of goldstone ... encase or leave on the surface. Work in a neutral flame.
So the first thing I tried was dipping a gather in clear and winding off a bead. This resulted in a very pretty, sparkly green bead. A bit dark, mind you.
Next up, I tried it just on white - which was quite nice, and the green shows quite well - it's still really dark though in places.
Next I tried it on ivory - dark ivory - to see how reactive it is. Hoo boy - very reactive. The halo around the dot each dot of frit is as wide as the dot. Might look better on light ivory - but I think this is one of those reactions that is a little over the top, visually. If you manually placed (with tweezers) a few dots of frit - you might get an interesting effect - but for just rolling - too much reaction.
On clear, just rolled in the frit and melted in.
And a white core, and then clear, with frit on top. This gives a bright white background, but still with a layer of clear so that light can shine up through the frit. This resulted in the brightest appearance.
Intriqued by the package saying "transparent" and the notes saying "opaque" - I put the frit on black. It looks black - but you do still see some sparkle. Actually - I kind of like this for the subtle sparkle without the blotchiness of frit.
This is a base of Effetre Pale Emerald - with a streak of Double Helix Triton, and reduced.
I thought the green on green might look more natural.
In fact - I think that is why I am not, generally speaking - a huge fan of frit. Blotchy and Patchy doesn't do it for me.
This is a Pale Emerald base, with White smeared on it, Silver Foil melted in, rolled in frit, encased in Pale Emerald, and mashed.
And finally - this is a base of clear, frit, encased in clear, heated and drooped, and then shaped, mashed and grooved.
The frit, being dark, holds up well to this sort of smearing and thinning.