A chalkboard/blackboard
It gets whiter and thicker when you ovulate.
There is no color that is whiter than white. White is the lightest color and represents purity and brightness.
A chalkboard becomes whiter as it gets dirtier with chalk dust.
It works because it has small microorganisms (microbe) that kill germs that make it Dirty and after using it the cloth will get whiter. So the strong ones that makes it white has lots of it.
Life Gets You Dirty was created on 1999-10-12.
Blackboard
it is usually gray when wet and for the first few years then it gets whiter with age
Given time everything gets dirty.
If the hamsters feet are dirty when it gets on it.
Comparative: Whiter Superlative: Whitest
A leather shoe