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on knife coatings
https://agrussell.com/blog/blade-coatings
in particular military
"......Parkerizing
Today we hear much about the gray/green color variation, I know of no phosphateing that will give a green color right out of the bath. For this color phenomenon to occur it is usually a contamination of the bath fluid, in most cases Cosmoline is the likely suspect. Another factor in the coloration is the type of steel used and the hardness after heat treating. I have seen many knives with blades of a different color then the pommel. This can be due to being parkerized at different times or the hardness of the different metals.
http://www.usmilitaryknives.com/knife_knotes_2.htm
The black ops and covert stealth blah blah terms are always thrown around. But we forget that sometimes it was just a group of guys who had to move around in the dark. My own paranoia would’ve lead me to blacken any shiny metal just like them.I believe you see the troops in band of brothers sooting up the ends of their rifle barrels( gas tube) with lighters before they went on a nighttime recon across the river. Two of the WW2 Garrand rifles i have, have blued barrels but the gas tubes are silver in color. They eventually figured out how to make the gas tube same as the barrel
I bet it was one of these.As far as I remember/understand, "black" finished knives started as military knives/bayonets with a "parkerized" finish (phosphate finish made by dipping in hot phosphoric acid) in WW II. The phosphate finish was primarily to reduce corrosion of non-stainless steel. It also made items dull and non-reflective. An oiled phosphate finish reduces corrosion reasonably well and is much more robust than bluing.
Black epoxy paint came along and got adopted for protecting non-stainless steel as a cost savings. (It is cheaper to paint than to maintain a tank containing hot acid.) I think I saw black protective paint on knives starting in the 80's. I don't remember when it became cool to paint stainless steel black.
on the m1905 bayonet... I tried to look up Bayonets ...so many of the photos of originals (not replicas/copies) showed what looked dark/black but might have been carbon steel blades with a patina.
I recall reading that during the design or first few production runs, Fairbairn or Sykes (whichever one was a cop in Hong Kong), WANTED the knives to be shiny. He figured that if you were going to fight with a man, you might as well intimidate him with the glint of his immanent doom.I bet it was one of these.
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What they were soothing up on those M1 .30 Garands from talking with WW2 Vets first hand was the ears & post etc on the front site & the apochure and adjustment knobs on the rear sight. Any gleam there could put off your target sighting day or night.I believe you see the troops in band of brothers sooting up the ends of their rifle barrels( gas tube) with lighters before they went on a nighttime recon across the river. Two of the WW2 Garrand rifles i have, have blued barrels but the gas tubes are silver in color. They eventually figured out how to make the gas tube same as the barrel