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==Congenital melanosis==
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*in calves and lambs
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*black discoloration of small irregular portions of the [[Liver - Anatomy & Physiology|liver]]
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==Haemosiderin==
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*in chronic passive congestion and surrounding areas where there has been prior necrosis and haemorrhage
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*found within the Kuppfer cells
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*use Perls' stain
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==Lipofuscin==
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*an insoluble golden brown pigment which occurs within hepatocytes
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*use Schmorl's stain - dark blue
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*increases with age - called the ''''senility' pigment'''
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*it is commonly seen in hepatocytes near to the centrilobular vein in older cats
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*no clinical significance
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==Bile==
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*especially prominent in obstructive jaundice
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*discolours the tissues green
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*intrahepatic bile canaliculi are distended with a greenish pigment - called '''bile plugs'''
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*larger foci are seen in long standing cases when the hepatocytes rupture: the discharged bile is then surrounded by macrophages and perhaps giant cells - called '''bile lakes'''
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*use Fouchet stain - green