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The ingestion of the new sun-tan capsules 'Orobronze' containing the carotenoid derivative canthaxanthin discolours plasma orange. This is noticeable in the plasma of blood donations received 4 days after starting the capsules and continues for a further 4 weeks after finishing the course. This cause of plasma discolouration should be recognised as it was found to mask haemolysis within a plasma sample.
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