What is erhlich reagent?

Erhlich reagent, also known as p-dimethylaminobenzaldehyde or Ehrlich's solution, is a chemical compound commonly used in forensic science and biochemistry to detect the presence of indoles, such as the amino acid tryptophan. When mixed with a substance that contains indoles, such as a biological sample or a drug, the reagent forms a characteristic color reaction that indicates the presence of the compound. The reaction is purple in color and is utilized in the identification of psychedelic compounds and some trypanosomatid parasites. Ehrlich reagent is an important tool in forensic toxicology for screening and testing of urine, blood, and saliva samples for the presence of illicit drugs and other compounds. The reagent is usually stored in a dark, dry place, away from light and heat, and is a corrosive and toxic chemical if it comes into contact with skin or eyes.