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'Blotting paper' is a type of paper or other material which is used to absorb an excess of substance (such as ink or oil) from the surface of an object.
Examples of its use include absorbing the excess ink left on parchment after writing with a fountain pen or in cosmetic papers used to remove excess lipstick or facial oils.
When used to remove ink from writings, the writing may appear in reverse on the surface of the blotting paper, a phenomenon which has been used as a plot device in a number of detective stories.
Certain illegal drugs, most notably LSD, are distributed on blotting paper. A liquid solution of the drug is applied to the paper, which commonly is perforated into individual doses and artfully decorated.