Blackening Chemicals Guide * Blackening Processes 1. Cold Blackening - Overview: Uses room-temperature chemicals to produce a black finish. - Pros: Easy to apply, low cost, minimal equipment required. - Cons: Less durable than hot blackening; suitable for indoor applications. * Common Chemicals: - Selenium dioxide-based solutions (e.g., Birchwood Casey Presto Black). - Proprietary cold blackening solutions. * Hot Blackening - Overview: Involves immersion in a series of heated alkaline baths to produce a black oxide layer. - Pros: Durable, corrosion-resistant, ideal for industrial use. - Cons: Requires specialized equipment, high temperature (~285°F). * Common Chemicals: - Sodium hydroxide (base for alkaline bath). - Nitrate and nitrite salts. - Proprietary black oxide salts. # Blackening Chemicals Manufacturer.