CMYK and RGB Printing Test and Colour Reference Guide with colour codes, charts, grids and swatches.: A must have print guide for self-publishers, ... choices are as they should be when printed. Paperback – May 8, 2022

There were specific complex colors I wanted to find a code for and the 16 grids were not nearly enough. If you are entirely unfamiliar with four color printing, this is a good place to start. But that's about it: if you are an artist looking for color codes/proportions that replicate colors in your work and are looking for print swatches to match, look elsewhere. This would be more useful for picking colors at the start of a project- but the range is limited. On the other hand, the 16 colorful grid pages are worth $1 apiece to do paper engineering, die cutting, origami and such just using them as fancy papers. I will keep looking and will probably return these (I got two so that I could communicate color with a partner graphic designer without having to actually be in the same space.)