Chrome Greens are produced by a combination of prussian blue and chrome yellow. This is usually done, not by mixing the separate colors dry, but in the process of manufacture, chrornate of lead and prussian blue solutions are combined in proportions to suit the shade required and precipitated together under proper conditions.

The ordinary green we meet with, both dry and ground in oil, contains only 10 to 20 per cent. of pure chrome green, the balance being adulteration. The pure color itself is too powerful and not suitable to form a good paint for ordinary purposes, nor will it lend itself well to being ground in oil without some admixture of adulterants.

Chrome greens thus prepared, are not permanent, fading after a time and losing all brilliancy of tone.