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