C 2253 (OTTO) Chromium nitrate, nonohydrate, GR 98%+ Cas 7789-02-8 - used in the manufacture of alkali metal-free catalysts and in preservation. C 2253 (OTTO) Chromium nitrate, nonohydrate, GR 98%+ Cas 7789-02-8 - used in the preparation of chrome catalysts, in textile printing operations, and as a corrosion inhibitor.