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I don’t know anyone doing nickel anymore (which in my experience is kind of fragile). A lot of the chemicals used in the old blueing processes are hazardous so you don’t see a lot of that anymore either.
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When Colt introduced the stainless steel Python in 1982-83 they stopped making bright nickel versions.
To get the bright nickel look all they had to do is offer Bright Polish or Ultimate Polish stainless.
That looks like bright nickel but without the fragile nature and the need for special plating equipment..
Colt never used any of the old bluing methods for the Python or any other guns after WWII.
After the war Colt, like almost all other gun makers began using the modern hot salts bluing process.
The only difference between any other maker or any other Colt model and the Python was the level of hand polishing needed to get the Colt Royal Blue finish.
The old story was that while other makers guns were on trucks heading to the distributors, the Python was still at Colt being polished.
Around 1969 Colt did change to a different chemical composition for their hot salts bluing, and this is noted as having a more mirror Black color then the 50's and 60's hot salts chemical that had a slightly more blue color.
Other then that the only difference with the Python and other guns was the ultra-high polishing that gave it that mirror finish.