Patent ID: 7569531
Filing Date: 2009-08-04
Classification: C11D

Abstract:
1. A laundry treatment composition which comprises from 5 to 60 wt % of a surfactant and from 0.0001 to 0.01 wt % of a combination of dyes which together have a visual effect on the human eye as a single dye having a peak absorption wavelength on cotton of from 540 nm to 650 nm, the combination comprising a photostable dye which is substantive to cotton, wherein the photostable dye is a bis-azo direct violet dye of the formula: where Z is H or phenyl, the A ring may also be a naphthyl ring, the Y group is a phenyl or naphthyl ring, which is substituted by sulphonate group and may be mono or disubstituted by methyl groups, wherein the laundry treatment composition is in particulate form.