Purple is very seldom used in English heraldry

It is nonsense, however, to say it is improper to use it, as it is quite good heraldry. Booke of Precedence (E. E. T. S., extra ser.), i. 96, note 1. 2. A cloth robe, dre , or mantle of this hue, dyeing purples and mauves on silk and wool.-Indian purple, an artists' pigment prepared by precipitating cochineal-extract with copper sulphate. It is a deep toned purple which is apt to blacken on exposure to light, and is now little used. - London purple, a residue from the manufacture of aniline dyes, which consists of calcium arsenite with some coloring matter. It is largely used as an insecticide.