Carpet Preconditioning
Preconditioning carpet to maximise soil suspension prior to soil removal has been an industry-accepted practice for many years. However, the Carpet and Rug Institute (CRI), USA, implemented its Seal of Approval (SOA) programme, which included spectrophotometre measurement of light reflected from cleaned carpet using the Association of Textile Chemists and Colorists (ATCC) gray scale to develop comparative DE values.