1. The problem statement, all variables and given/known data For the identification of β-naphthol using dye test, it is necessary to use 1. dichloromethane solution of β-naphthol 2. acidic solution of β-naphthol. 3. neutral solution of β-naphthol. 4. alkaline solution of β-naphthol. 2. Relevant equations NA 3. The attempt at a solution There must be a reason which we can apply anywhere not for this question only. There is something to do with dye but dye is a colour or an Azo compound. How can we tell dye is basic or acidic? If we know that also then how to identify the given naphthol?