We are one of India's leading manufacturers, exporters & suppliers of Ortho Tolidine Base (OT Base). Its chemical name is 4-(4-amino-3-methylphenyl)-2-methylaniline, o-Tolidine. The CAS Number of Ortho Tolidine Base (OT Base) is 119-93-7 and its chemical formula is C14H16N2. The most common end use is Pigments and its various other synonyms are o-Tolidine.