Not seen a yellow one,how many colours did they do? 
Just adding to this thread as I have a little more to offer (missed it first time around).
A yellow one is unusual, so was this opaque or clear, M?
But of the colours I know of:
OPAQUEBlue
Green (Keith, if your other green one isn't uranium, this is probably later)
Yellow
Opal White
CLEAR/TRANSLUCENTBlue
Amber
Green
Clear (flint)
MATTHEY CRINKLESYellow crinkles onto clear
Apart from these there are many variations to the embossing on the base: Parker; Chance; Fibreglass; With Compliments of Chance (plus others). I also have two examples where the top ring is embossed. Additionally, there are some with transfers affixed and a few that are (ahem) tetradecagon (OK, that's 14-sided

) in a translucent blue. These appear in
this thread.
ANOMALIESA very deep-amber, which borders on being ruby. It also has a slightly different base, so could have been an early trial glass mix.
A clear glass one that's been engraved!
More will be revealed when the second book's released.