The sheet contains extra absorbent fibres.It acts like a magnet protecting your clothes by trapping loose dye and colour from the water. It assures maximum protection for your clothes against discolouration and colour runs. Will I have to wash my whites and coloured clothes separately? No. You can wash your whites/light coloured clothes along with your bright/dark coloured clothes in the same load either in the washing machine or in the bucket. Will my whites/coloured clothes stain or catch colour? No. Your white or light-coloured clothes will not catch any color because the sheet will absorb the colours.