Moon doesn't have light of its own.
Sunlight or white light is the mixture of visible colours . When sunlight falls on moon ,it reflects all the visible colours equally, making the moon to appear white.
However during the lunar eclipse the earth looks Red because it comes between the sun and the moon.
This happens because of Earth's atmosphere. Sunlight coming from sun scatters into the light of shorter wavelength due to atmosphere . However ,Red colour which has the longest wavelength is least scattered. Hence it goes to the moon, making it look red.
