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Thanx Stu. Blueing is simple. Degrease & add electrical tape to tang sides to prevent overrun. Apply gun blue or preferred acid to jimps. Rinse with soapy water when desired colour is achieved....

This one was a blade only restore so did very little to the scales.
The macro shots show the micropits that remain so have to use your imagination for 'before' pics :)

Fiddly job sanding around...