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Horological Meandering

The Blues

 

Who loves blued steel (or indeed other metals) in their watches? Screws, hairsprings, hands. Other parts?

 

Bluing is a passivation process whereby a ‘protective’ non-reactive layer, only nanometres thick, is created or applied to the metal. In the case of steel these are usually oxides, like magnetite, that protect against further rusting.

 

I am a sucker for blued screws. I know they can overpower a movement, but I find it hard to say “no”. Perhaps it started when I tried to heat-blue my own screws in a GO Masterclass in 2007? You have to be observant and quick to get the colour hue just right.

 

This particular photo of the Breguet La Tradition, taken in the evening light, seems to catch the blue hands and screws.

 

I would love to see your photos of blue bits!

 

Andrew




Paul Gerber provided this video to demonstrate how he blues his screws:

I screw the screws into a plate for grinding. I then polish the screws to a very high finish. After cleaning, I heat the screws while still on the plate and dip everything into a blue salt process, increasing the heat gently to acheive the desired blue color. Then I immediately remove everything from the solution and allow to cool. I then clean the screws and they are ready for assembly.

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