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Sender comments that prior to sending this in, they observed: 'Positive Ehrlich reaction, but Marquis shows quite a vivid orange colour change, which is not consistent with the usual muddy brown seen from paper alone. Froehde is a much more vivid yellow too.'
Jul 19 2020: A reference standard for ALD-52 has been ordered; this sample will be re-analyzed once the lab receives it. Check back here for an update in a few weeks.