Hermcol®ʻO ka RN melemele he puaʻa mono azo, me ka malu melemele ʻulaʻula ʻulaʻula, akā ʻoi aku ka maikaʻi o ka malu ʻulaʻula ma mua o Benzidine Yellow HR, a he kūpaʻa maikaʻi ia i nā solvents, māmā wikiwiki, kūpaʻa waika, kūpaʻa alkali a me kahi huna kiʻekiʻe.®Hāʻawi ka RN melemele i nā aka melemele ʻulaʻula.