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  • @ murtle - can you just heat the frame to get the spots?
    I reckon it's 'Oil-Bluing'.. dip it in some oil / chemicals first.

    Just heating. I did it at school. Use a torch and heat the metal. I did it at school. Colours go from red to blue to white. White means you've melted it. I wouldn't be surprised if that bike snapped at some point because of the heated spots.

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