terra alba

/T EH1 R AH0 AE1 L B AH0/
noun
  1. 1

    A white earthy substance consisting of burnt gypsum and aluminium silicate (kaolin), or some similar ingredient, such as magnesia. It is sometimes used to adulterate certain foods, spices, candies, paints, etc.

Source: https://en.wiktionary.org/wiki/terra%20alba