for qualitative measurementsAcetic acid. 2 mL Ethyl alcohol . 2 mL Acetic anhydride . 2 mL Methanol. 2 mL Aniline . 2 mLMethyl ethyl ketone . 2 mL Butyl alcohol. 2 mL1-Methylnaphthalene . 2 mL Dioctyl phthalate . 2 mL Benzoic acid (2% w/v in p-Xylene) . 2