Answer:
I am a kind of coat that can only be put on when wet. What am I?
I will disappear every time you say my name.
You can see me in water, but I never get wet. What am I?
The more I dry, the wetter I get. What am I?
Tear me off and scratch my head what once red is now black.
I am your mother's brother's only brother in law. Who am I?