The Dische test, or Dische reaction, is used to distinguish DNA from RNA.
It was invented by Zacharias Dische.
Dische's diphenylamine reagent consists of diphenylamine, glacial acetic acid, sulfuric acid, and ethanol.
A more intense blue color indicates a greater concentration of DNA.
The acid converts deoxyribose to a molecule that binds with diphenylamine to form a blue substance.