What are fingernails made of? Why do they appear pink?

Fingernail is a lifeless, translucent outgrowth of skin. It appears pink because it lies over a bed of tissues that is rich in blood. It does not, however, grow from this bed. It originates in a matrix of specialized skin cells that lie below the whitish half moon that is visible at its base. Unlike the cells of the translucent plate, those in the matrix are very much alive, constantly growing and pushing the cells ahead of them toward the fingertip. As they emerge from the matrix, the cells become filled with a hard protein called keratin.
Unlike other skin cells, these highly keratinized cells are not slought off when they die. Instead, they become compact into the structure that we call a fingernail. The nail grows continuously. If it is removed without damage to the matrix cells, a new nail would grow in it place.

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