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Pallor mortis (Latin: pallor "paleness", mortis "of death"), the first stage of death, is an after-death paleness that occurs in those with light/white skin.[1] An opto-electronical colour measurement device is used to measure pallor mortis on bodies.
Pallor mortis occurs almost immediately, generally within 15–25 minutes, after death. Paleness develops so rapidly after death that it has little to no use in determining the time of death, aside from saying that it either happened less than 30 minutes ago or more, which could help if the body were found very soon after death.
Pallor mortis results from the collapse of capillary circulation throughout the body. Gravity then causes the blood to sink down into the lower parts of the body, creating livor mortis.