Blackstone CMYK fountain pen ink mixing set.
Four 30 mL bottles of fountain pen ink in every color imaginable, in every shade imaginable, from only four basic colors. Cyan (C) Magenta (M) and Yellow (Y) can be blended in different proportions to make any color imaginable and the addition of Black (K) can adjust the shade of the ink to exactly how you like it.
Blackstone's CMYK inks are made from pure cyan, magenta, yellow and black dyes. These pure dyes create the pure, base CMYK color that are essential to create the full color spectrum.
These inks have been specifically developed to be mixed with each other to create the full CMYK color spectrum.