Jade Admixture
Source: Taken directly from Ink Monkey Bones #4 on Eric Minton's blog.
Jade admixtures are most often cosmetic in nature, wherein substances with compatible magical qualities or which are magically null are added in order to change the jade’s appearance. Common admixtures of this sort include colored jades that have been lightened or darkened through the addition of powdered black or white Marble, translucent jades that incorporate sizable amounts of glass or crystal, or the addition of metal filings to make the jade sparkle.
Alternatively, one color of jade can be mixed with another to blend their magical qualities. Such admixtures include the off-white hue of “Ash Jade”, which includes a small amount of black jade for resilience, and the many peculiar properties of blue-green jade alloys. The admixture of red and blue jade to create purple jade falls within both categories; its fusion of unpredictability and speed makes it useful for both arms and armor, while its unique hue makes it popular among the Chosen of Endings.