These 10 animal facts will amaze you. Solar glass is a type of window and building material that is designed to block radiant heat transfer, which is basically the amount of heat from the sun that passes through the glass and into whatever space is on the other side.
Human skin color can vary from almost translucent to almost black. This range of colors comes from the amount and type of a pigment called melanin found in the skin. There are two types of melanin--eumelanin and pheomelanin. In general, the more eumelanin in your skin, the darker your skin will be. People who make more pheomelanin than eumelanin tend to have lighter skin with freckles. Like many other traits, the amount and kind of pigment in your skin is controlled by genes.
There are many types of hyper-pigmentation, but the following 3 are the most probable causes for dark spots, brown spots and age spots to appear on the skin. 1  Sun Exposure: Darker pigment spots such as age spots are caused by sun exposure and harmful UV rays that produce excess melanin. When UV rays are deposited in the skin where it then triggers the melanin in your skin to over produce and leave dark spots and age spots on the skin.