Brownell Formula 44/40 Instant Gun Blue

Works great. I tried it and it's a competitor side to side and I don't see any difference.

from what i had seen online from ppl using stuff like this, not this very brand just a solution to black metal, had trouble getting the parts to come out all the same, one would be covered an the next would be blotchy so i didnt know what to expect. when i cut the foil seal off the tip of my blade was blade when i pulled it back so i knew it worked but didnt see how well it worked til i brushed a little onto a toe clamp i had made an it really was instant an didnt take near as much as i expected. i didnt want to dunk the hole part in the solution so i was just brushing it on an this will be the method i use from now on unless i run across a large part or something but this stuff works really well an if ur looking to black some metal parts this works. buying it in small 2oz bottles is probably not the best way if u have alot of parts or large parts but i will be sticking with this brand.

As the listing states, the product blues(black) almost instantly. Works really well. My only complaint is that it never gets truly black. More of a dark gray color. I used it to reblue a vintage airgun that was rusted. It came out like new. Just with it was a bit darker.

This stuff reacts instantly and is very forgiving. I use alcohol or mineral spirits to prep metal surfaces on my blacksmithing projects and get great results from this. You don’t have to do multiple coats either to get good finishes. 1 bottle lasts a while and be sure to change your application instrument (swab or cotton ball) after each use or you can contaminate the fluid.

Works great to re-finish rusty bonsai tools.Love this stuff.

Well packaged, fast shipping. Would do business with again.

Excelente terminado

THIS IS THE BEST EASY TO DO BLUE ON THE MARKET,IV TRYED THEM ALL,I WONT MENTION ONES THAT DONT WORK,THIS IS THE BEST,YOU WONT BE DISSAPOINTED. BIGGER BOTTLE WOULD BE GREAT THO