Frosted glass can be light, but not see the glitters through it, most often used in bathroom and toilet.

Sunbeam penetrated the glass must wear a refraction, if the two sides of the glass surfaces are smooth, two refraction has rules, we can see luminous objects through the glass. One side frosted glass is not smooth, it makes passing light scattered randomly open, you can not see the object across the frosted glass.

If the frosted glass poured into the water, rough surface layer has soiled water, water fill into the low-lying part of the surface, so that the entire outer surface is smooth. At this time, frosted glass changed to translucent state.