This bleaching was called crofting in England, and grassing in America.
grassing is simply the use of grass or any similar material for the same purpose.
There were three methods of accomplishing this work, which in our camp were technically known as sanding, grassing and washing.
grassing intervenes between each turn, and in some instances the pieces are rubbed before the last soda boil.
Old English græs, gærs "herb, plant, grass," from Proto-Germanic grasan (cf. Old Norse, Old Saxon, Dutch, Old High German, German, Gothic gras, Swedish gräs), from PIE *ghros- "young shoot, sprout," from root *ghre- "to grow, become green" (related to grow and green).
As a color name (especially grass-green, Old English græsgrene) by c.1300. Sense of "marijuana" is first recorded 1938, American English. Hawaiian grass skirt attested from 1937; keep off the grass by 1850.
Any of a large family (Gramineae or Poaceae) of monocotyledonous plants having narrow leaves, hollow stems, and clusters of very small, usually wind-pollinated flowers. Grasses include many varieties of plants grown for food, fodder, and ground cover. Wheat, maize, sugar cane, and bamboo are grasses. See more at leaf.