1. Department of Chemical Engineering, Queen's University of Belfast, Belfast BT9 5AH, Northern Ireland
2. Nabisco Brands, East Hanover, New Jersey 07936, U.S.A.
3. Department of Colour Chemistry and Dyeing, Leeds University, Leeds LS2 9JT, England
4. International Wool Secretariat, Ilkley, West Yorkshire LS29 8PB, England