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The blue on the screws of the old peacemakers is a flame bluing process. YOu heat the part till it gets the color you want. Thats a very simple explanation, but it covers the basic process. It is a delicate blue. It was also called temper bluing. I'm surprised you asked the question since you had fire bluing in your topic post.

The darker blue/black you see now is from hot bluing. many years ago, before hot bluing, rust bluing was the order of the day.For looks there is nothing quite like rust bluing, but it is pretty labor intensive.

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<font size=-1>[ This Message was edited by: peter Zahn on 2001-04-10 21:26 ]</font>
 

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I suspect fireblue is another term for the temper bluing, just a guess though.

I've recently become aware of something else. Brownells sells NitreBlue Bluing Salts. They say it gives fire-blue colors. Looks like it is very easy to use too. It's a hot process, 570 to 650 degrees.
 

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Heated color Temp Temper item
of carbon steel

Faint yellow 420 knives,hammers
light yellow 440 reamers
straw yellow 460 dies punches
dark yellow 480 large taps
brown yellow 500 axes, drifts
full purple 540 cold chisels
full blue 560 springs gears
medium blue 600 spokeshaves
light blue 640
dark red 1290
cherry red 1650
orange red 2010
white 2550
blue white 2900
acetelyene flame 4080 HOT
electric arc light 7200 REALLY HOT
 
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