pearl white

Short definition from Wiktionary

Noun

1. 1
   Basic bismuth nitrate, or bismuth subchloride; used chiefly as a cosmetic.
2. 2
   A variety of white lead blued with indigo or Prussian blue.
3. 3
   A material made from fish scales, used in making artificial pearls.
4. 4
   Any of various pierid butterflies of the genus Elodina.