How can I mix just three Procion MX primary colors to get all the colors I want?

Dreamline dye suppliers in the Netherlands has two extremely useful charts purporting to answer this question, though they use six different colors, no more than three in each mixture. Unfortunately, they appear to be available only in Dutch. Here is a link to my attempt at translating their tables to English.

Their names, translated from Dutch, are an elaborate scheme of precious stones. The colors shown in the table are only html approximations of the swatches shown at the Dreamline web site. How accurately they are displayed will depend upon the monitor; they will not print well, so you are advised to see the color charts at Dreamline.

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