CORO DG -27 ( 2 IN 1) CORO DG‑27 (2‑in‑1) is a specialized industrial-grade chemical formulated for metal finishing, especially suited for a 2‑step treatment in one solution — typically combining degreasing and blackening/chemical conversion processes. Commonly used in manufacturing and metal pretreatment workflows, including before powder coating. - 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: - For specific technical details, such as concentration ratios, application temperatures, and safety precautions, it's best to refer to the product's technical data sheet (TDS) or contact the manufacturer directly. #CORO DG -27 ( 2 IN 1) Manufacturer.