Abstract
This paper describes a study of the wash fastness of a number of dyed cotton and nylon substrates in the C06/C2S, C08/C2S and M&S C4A (60 °C) wash fastness tests, using both zeolite‐ and phosphate‐containing detergent formulations. The staining of adjacents was generally shown to be at least 0.5 grey scale units less in all three tests when the zeolite‐containing standard detergent formulation was used. Staining in the C06/C2S test was usually 0.5 grey scale units higher than in the corresponding C08 and M&S C4A test because of the lower liquor ratio at which the former test was conducted. It is therefore recommended that, if the C08 test is to set demanding levels of colour fastness, the liquor ratio at which it is conducted should be reduced to ca. 30:1.
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