And in my file of commercially made beads (which I shoot for the website over at BeadFX), I just spotted these:
There seems to be some sort of resemblance. Makes you wonder, doesn't it.
Skylla is a silver striking and copper ruby glass. The silver strike produces bright blues, purples and teals while the copper ruby produces reds when applied in thin layers all the way to black if thickly applied. (See above!) Skylla has several improvements over our previous silver/copper striking colors. The colors are brighter, the reset is complete, the nucleation is heterogeneous and the copper ruby is redder.
For best results follow the striking sequence; Reset in a hot flame, Cool until the glow fades, Reheat at the tip of the flame.