purple lakes

purple lakes

[′pər·pəl ′lāks]
(materials)
A class of lake (pigment) used in printing inks; derived from a combination of such compounds as β-hydroxynaphthoic acid and 2-diazonaphthalene-1-sulfonic acid.
References in periodicals archive ?
The country below was littered with jagged mountain ranges, isolated purple lakes, pockmarked craters and puffs of billowing steam.