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The web page states the following, "Cold Chemical Blacking of Iron and Steel." We saw that the web page said " Was originally developed to provide easy and effective blacking of Iron and Steel components at room temperature." It also said " A Simple to follow room temperature process. Safe, re-usable non-toxic chemicals. The finish is not affected by exposure to heat or light. Average process time less than 15 minutes. The process solutions are supplied ready to use. No heat is required by the process. Finish is hard-wearing and durable." The header had black blacking matt chemical solution selenium black-it blackit black it model engineer engineering gun bluing steel iron cold room temperature brass antiquing metalblack coldblack cold metalblak as the highest ranking optimized keyword.