How can I understand paint colorant systems?
I worked in the paint department of Home Depot way back when and I can tell you that their paint labels list the letter of the colorant in the first row followed by the ounces and fractions of an ounce of that color.



The current label above is newer than what I worked with, and the color names have changed, but that label says that quart of paint has 0 ounces and 126/384ths of an ounce of the DL color, 56/384ths of FL and 6/384ths of RUL.

The different brands format the information in different ways, but it's all going to come down to colorant and quantity.  If I had to guess, I would say that your label would have 3 ounces and 22/128ths of W1.  Of course you would have to ask what the fraction was because I made up 128th and have no idea what it really is.

You would also need to know the codes for all the colorants.  There's probably 8-10 different colorants - it's not just primary colors.