From what i've seen, Ritek may have 3 dyes in use:
Their 'G' Dye,
Their 'TG' Dye
Their 'JS' Dye
and 'ricoh's' dye, which they don't normally use, since it is Ricoh's dye.
There may be others, but I'm not sure. If I get a chance, I'll pester my contact at Ritek about their dye system, and see what he says. He's been sounding a bit frazzeld lately though, so I don't know if he'll feel up to answering questions at this point (I think it's Christmas rush related!).
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media