Ocher pigment, after which the condition was named, due to the similar color of affected tissue.<unk>  is a syndrome caused by the accumulation of homogentisic acid in connective tissues. The condition was named after the yellowish (ocher-like) discoloration of the tissue seen on microscopic examination. Macroscopically, though, the affected tissues appear bluish-grey because of a light-scattering phenomenon known as the Tyndall effect. The condition is most often associated with alkaptonuria, but can occur from exogenous administration of phenol complexes such as hydroquinone. It was first described by Rudolf Virchow in 1865.
Ochronosis
Zinc toxicity
Fluoride toxicity
Chromium toxicity
Copper toxicity
Lead poisoning
Skeletal fluorosis
Iron poisoning