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Table 2 Rare, usually work-related, local toxic causes of yellow nail discoloration, from [90]

From: Yellow nail syndrome: a review

Epoxy systems: metaphenylenediamine, 4,4′-methylenedianiline
Flower handling
Pesticides: diquat, paraquat, dinitroorthocresol, dinobuton
Chromium salts
Dyestuffs: dinitrosalicylic acid, dinitrobenzene, dinitrotoluene, trinitrotoluene