Tattoo identification by the sodium sulfide-silver nitrate technique assures proper orientation of the material obtained by the small knife biopsy.
GOLDMAN L, RICHFIELD D, KUBITZ D. Small Biopsy With Tattoo Identification of Tissue. Arch Dermatol. 1964;90(2):195–196. doi:10.1001/archderm.1964.01600020063015
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