1. Dept of Textiles, UMIST, PO Box 88, Manchester M60 1QD, UK
2. Procter & Gamble Ltd, Whitley Road, Longbenton, Newcastle upon Tyne NE12 9TS, UK
3. Lever Brothers Ltd, PO Box 69, Port Sunlight, Merseyside L62 4ZD, UK
4. Unilever Research, Port Sunlight Laboratory, Quarry Road East, Bebington, Merseyside L63 3JW, UK
5. Henkel KGaA, WEW‐Waschtechnik, Henkelstrasse 367, D‐40191 Dusseldorf, Germany