mordant

Bitingly sarcastic.

Incisive and trenchant.

Bitingly painful.

Serving to fix colors in dyeing.

A reagent, such as tannic acid, that fixes dyes to cells, tissues, or textiles or other materials.

A corrosive substance, such as an acid, used in etching.

To treat with a mordant.

To imbue or treat with a mordant.

Biting; keen; caustic; sarcastic; severe.