Black with a tinge of blue to it in the light is correct. Nitre is how Parker originally finished them.
Rust blue will of course give you a black, but rust bluing small parts like guards, triggers and screws is a pain in the butt. It is much easier to hang them in the salts for a while and pull them out.
I quench in water immediately then dry and put into motor oil for 24 hours.
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B. Dudley
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