CORO DG -27 ( 2 IN 1) - ​CORO DG-27 (2-in-1) is a chemical solution developed by Vitarag Chemicals, designed to perform both degreasing and derusting in a single step, primarily for metal surface preparation. - CORO DG-27 (2 in 1) is a specialized blackening chemical product used in manufacturing industries for metal finishing. This product is designed to provide a dual function of blackening and corrosion resistance in a single application process. Here’s a detailed overview: * Application Process: 1.Immerse the metal part in CORO DG-27 solution.​ 2. Allow 3–5 minutes for the solution to act.​ 3. Rinse the part thoroughly with water to remove any residual chemicals.​ 4. Proceed with further treatments as required. #CORO DG -27 ( 2 IN 1) Manufacturer.