If your CPU is running to hot you should consider better cooling methods to avoid damage. For help on converting C to F check out our Temperature conversion calculator . Most heatsinks are made from aluminum. This allows heat to escape into the air easily. Aluminum heatsinks are great at releasing heat from their fins so that passing air can carry the heat away.
Conduction allows heat to spread from one solid object to another as long as the parts are touching.
This property makes copper great for absorbing heat from the attached component and spreading the heat to the rest of the heatsink. However, copper heatsinks do not release heat from their fins as well as aluminum heatsinks do. The color of a heatsink is really not important. Theoretically, a black heatsink radiates heat from its fins faster than a silver heatsink. However, a black heatsink will also absorb radiant heat from other nearby hot components faster than a light color heatsink would.