I received a small bottle of the Oxpho-Blue, got a can of acetone and tried this Oxpho product on the barrel of my .32 Beretta, was totally disappointed in it! I tried the recipe evan price used {his methods}, sorry evan, even after 2 applications it didn't do what was needed. I tried the 0000 steel wool and the oil process after heating and applications, left the barrel splotchy at best. The Oxpho "might" have darkened the barrel "some", I don't have any equipment to verify such, so........ I got out the Cold Blue cream, made 2 applications with that, this time around, I had the barrel darkened to look like its supposed to look, like new and with a beautiful luster! Possibly the steel used in Beretta's barrels is different than some who've used the Oxpho on their firearms with good success, I didn't and won't use this gunk again. YMMV