US Pat. No. 10,655,273

DYED FIBERS AND METHODS OF DYEING USING N,N?-DIACETYL INDIGO

Stony Creek Colors, Inc.,...

1. A method of dyeing a fiber, the method comprising: contacting the fiber with a dye liquor at a dye liquor temperature of about 30° C. to 115° C. to form a dyed fiber, the dye liquor comprising N,N?-diacetyl indigo and a salt solution having ionic strength of about 0.03 M (moles/liter) to 1 M and pH of about 3 to 8 at 20° C.