"JS-Dye is Ritek's way of saying that they come from "J" and "L" production lines. I've eaten myself through half a spindle of these and I am impressed with the results, I'll go and buy another spindle soon (before the 1 November tax-raise )"
That's not true at all. JS is the dye formulation. RiTEK's J and L production lines also make discs using other formulations, such as TG and K.
To find out the dye type of a RiTEK CD-R, look at the serial number printed on the clear plastic hub of the disc. You'll find that the first character is a LETTER, representing the production line, and then a few characters down there should be one or two LETTERS representing the dye formulation, such as G, K, JS, J, S, or TG. BTW, SMART-BURN does not recognise K-dye properly and lists K-dye discs as being S-dye.