BLACKENING CHEMICALS REVIEWS - Reviews of Blackening Chemicals Blackening chemicals are widely used in metal finishing to provide a dark, corrosion-resistant coating on various metals. Reviews often highlight their effectiveness, ease of use, and specific applications. Here’s an overview of some popular blackening chemicals and user feedback on their performance: 1 . Birchwood Casey Perma Blue Liquid Gun Blue - Description: This product is primarily used for re-bluing gun barrels and other firearm components but can also be used on other steel objects. - Reviews: . Pros: Users appreciate its ability to provide a deep, rich blue-black finish and its relatively quick drying time. It's noted for being easy to apply and effective on minor scratches and worn areas. . Cons: Some users report that it may require multiple coats for optimal results and can be less effective on highly polished surfaces or stainless steel. - User Feedback: . "Great for touching up blued steel; just follow the instructions carefully." — Amazon Review . Works well, but be prepared to do several applications for best results." — MidwayUSA Review - Rating: Generally positive, with average ratings around 4.5 stars out of 5