Colour Change of Light-Coloured Coton Fabrics During Washing

Abstract

Light-coloured samples dyed with Indanthrene stable dyestuffs were washed at 95 °C with a perborated detergent for universal washing, with and without optical brightener. The greatest change of colour occures if with optical brighteners samples are washed, which were not optically bleached in the mill. These changes occured during the process of washing caused by the effect of optical brighteners in detergent. Somewhat less changes of colour were established on those samples, which were not optically prebleached in the mill, but washed with a detergent without optical brightener, ft was found that changes are caused by chemical bleaching, which caused oxidizing effect of perborate in detergent. As in home laundering the pastel coloured temperature of 95 °C, it is recommended, the light coloured linen shade in the mill with optical brighteners. In this case the changes of colour after washing are the least.