Sadhana Nitro Chem Ltd. Offers Metanilic Acid. Sadhana Nitro Chem Ltd is an ISO 9001:2000 certified company. The physical properties of Metanilic Acid are off white to white colored powder in appearance. The purity is minimum 99.0 percent and CAS number is 121-47-1. The molecular weight is 173.2. The Metanilic Acid Dye Intermediate is used in the manufacture of Azo Dyes, Direct Dyes, Reactive Dyes and Fluorescent brightening agent.