Methods for assessing the resistance of coated fabrics to discoloration and for assessing staining in the coating polymer of coated fabrics to silver and copper components. To be read in conjunction with BS 3424-0Cross References:BS 135, 458, 805BS 1006BS 1595:Part 1BS 3424:Part 0BS 3424:Part 2BS 3978Partially replaces BS 3424:1973.