This pyridine, also known as NDSB 201, presents as a white to almost white, odorless crystalline powder. It is known to be very soluble in water and very slightly soluble in ethanol. Store in a cool and dark place, under inert gas and protected from moisture, as this substance is hygroscopic. 1-(3-Sulfopropyl)pyridinium Hydroxide Inner Salt is incompatible with oxidizing agents, acids and bases. This chemical causes skin irritation and serious eye irritation.