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Figure 1. Porphyria cutanea tarda.
Water-soluble porphyrins from a liver-biopsy specimen from a patient with porphyria cutanea tarda show pink fluorescence under a Wood's light (405 nm). The biopsy specimen (short arrow) was preserved in saline solution to prevent desiccation and then transferred to a piece of gauze. Drops of saline containing fluorescing water-soluble porphyrins, including uroporphyrin (8-carboxylporphyrin) and 7-carboxylporphyrin, stain the gauze pink around the specimen and elsewhere (long arrow).
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