What is the skin colour of Polar Bear?

Polar bears' fur consists of a dense, insulating underfur topped by guard hairs of various lengths. It is not actually white — it just looks like white. Each hair shaft is pigment-free, transparent with a hollow core that scatters and reflects visible light, much like what happens with ice and snow. Polar bears look whitest when they are clean and in high angle sunlight, especially just after the they shed old hair or skin to make way for a new growth, which usually begins in spring and is complete by late summer. Before shedding their old hair or skin, accumulated oils in their fur from the seals they eat can make them look yellow.