What else can be used to identify DNA besides diphenylamine?

Methyl green is used for intracellular DNA staining, and diphenylamine is used for extracellular DNA recognition. In high school, methyl green is often mixed with pyrrolidone to make the DNA in cells show different colors for observing the distribution, while diphenylamine is often used to identify crude DNA. Under the condition of boiling water bath, the reaction between DNA and diphenylamine is blue. If only identification is asked in the title, it should be diphenylamine.