| abstract |
IMPROVED WHITENING AND BRIGHTENING OF LAUNDRY, ESPECIALLY COTTON ARTICLES, ARE OBTAINED BY TREATING SUCH LAUNDRY WITH AN AQUEOUS SOLUTION OF BLUE DYE OR MIXTURE OF SUCH DYES WHICH IS SUBSTANTIVE TO THE ARTICLES OF LAUNDRY AND IS CAPABLE OF TINTING THEM WITH A SLIGHT BLUE COLOR, REMOVABLE BY A CHLORINE BLEACH, AND A FLUORESCENT BRIGHTENER SUBSTANTIVE TO THE ARTICLES AND RESISTANT TO CHLORINE AND SUNLIGHT BLEACHING. THE DYE OR MIXTURE OF DYES GIVES THE LAUNDRY A DESIRABLE BLUE TINT WHEN IT IS NOT SUBJECTED TO CHLORINE OR SUNLIGHT BLEACHING AAND WHEN SUCH BLEACHING IS AFFECTED AND THE BLUE IS BLEACHED (IT IS NO LONGER NEEDED TO COUNTERACT ANY YELLOW OF THE LAUNDRY BECAUSE THAT, TOO IS BLEACHED) THE BLEACH-STABLE BRIGHTENER EXERTS ITS BRIGHTENING EFFECT. UNLIKE TREATMENTS WHERIN BLEACHRESISTANT DYES ARE EMPLOYED, ANY BUILD UP OF BLUING DUE TO REPEATED TREATMENTS MAY BE REMOVED. ALSO DISCLOSED ARE COMPOSITIONS OF SUCH MIXED DYES AND BRIGHTENER, AND DETERGENT COMPOSITIONS CONTAINING THEM. |