How do you know how the hands on a watch were blued?

I know the best blued hands are heated and not just painted but is there a way of knowing other than what the watch company states ?..Thanks for any replies

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IMO if it's a Grand Seiko you don't need to question it. Love the reflection of the blue second hand in this pic

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I've never had a watch with blue painted hands/screws. Anyway I try to answer:

  1. The brand. No established original brand with good reputation will do that. At least I never heared it.

  2. The price. Thermal blueing is an additional process that requires facilities, machines, staff and experience. Means: more costs.

  3. Take a closer look. On painted parrs you should be able to see a layer of painr or particles. Especially on the joints to other parts. On thermal blued there is nothing to see as the metal itself has changed its color.

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Thermally blued hands can have slight inconsistencies in the colour as it's aged, & you can see with a loupe it's the hue of the metal & not a coating.

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Best way it to get a jewellers loupe and examine the parts. Genuine blueing will be a very clean, blue finish to the metal itself. But any cold blueing or blue-effect paint will leave ripples, as they are both very hard to apply evenly. For a much older watch, that might be harder to discern, as a bit of rust/patina may look like this, too. So don't completely write off vintage watches if the blueing isn't perfect, as it doesn't completely protect the metal from oxidisation.

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It's my understanding that heat blued hands will appear black or blue depending on the light, as per the following photos:

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tempus

It's my understanding that heat blued hands will appear black or blue depending on the light, as per the following photos:

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Thanks for the information yes i have watches where the hands turn black to blue .