This paper is sponsored by the Fastness Tests Committee to give the maximum time for testing and evaluating the proposed formula before the next ECE and ISO meetings. Members of the Fastness Tests Committee have not yet had time to study in full the results presented in the paper, and therefore do not necessarily agree with the views expressed by the author. (The paper was previously published in German in the September 1986 issue of Textilveredlung.) In the paper a formula is presented for the evaluation of the change in colour that provides for the determination of fastness ratings by means of colour‐difference measurements. The results agree well with the mean judgement of experienced assessors, who determined the ratings by means of the ISO 105‐AO2 grey scale.
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H. Ulshöfer (1986) studied this question.
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