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haematin

British  
/ ˈhɛmətɪn, ˈhiː- /

noun

  1. biochem a dark bluish or brownish pigment containing iron in the ferric state, obtained by the oxidation of haem

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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But this substance, as well as the so-called haematin used by me, ought perhaps to have been classed with indigestible substances.

From Insectivorous Plants by Charles Darwin

Haemoglobin, the red colouring matter of vertebrate blood, C758H1203N195S3FeO218, and its derivatives haematin, C32H30N4FeO3, and haematoporphyrin, C16H18N2O3, are colouring matters about which we possess definite chemical knowledge, as they have been isolated, purified and analysed.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" by Various

On the third day the glands in contact with the haematin were blackened, and some of the tentacles seemed injured.

From Insectivorous Plants by Charles Darwin

Thus haematin is found in the so-called bile of slugs, snails, the limpet and the crayfish.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" by Various

The secretion of Drosera and gastric juice were both able to dissolve some element or impurity out of the globulin and haematin employed by me.

From Insectivorous Plants by Charles Darwin

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