The results of four independent investigations have been used to estimate the chances of any experienced colourist wrongly rejecting an acceptable sample. Seven colour‐difference formulae have been assessed against three sets of visual judgments, and the Adams‐Nickerson formula has been found to be consistently better than any other. Its use would increase the number of wrong decisions made, but the increase would be confined to wrong rejections.
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Keith R. McLaren (1970) studied this question.
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