BLACKENING AGENTS FOR METAL - Blackening agents for metal are chemical solutions or compounds used to create a dark, often black, finish on the surface of metal parts. This process, known as blackening or black oxide coating, improves corrosion resistance, enhances appearance, and reduces light reflection. Here's an overview of common blackening agents and processes: * Types of Blackening Agents by Metal Type 1. Steel and Iron - Cold Blackening Agents: - Selenium-based solutions (e.g., Birchwood Casey Presto Black) - Operate at room temperature. - Suitable for small-scale or low-heat environments. 2. Stainless Steel - Requires special formulations due to chromium content. - Solutions like sulfur salts, oxidizers, and accelerators are used. - Often done via electrochemical or chemical immersion methods. # Blackening Chemical Manufacturer.