colours in stainless steel

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paul.fr

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colours in stainless steel
« on: 31/07/2007 16:46:49 »
Whilst doing the washing I noticed many colors on the bottom of a stainless steel pans(not in a rainbow, all mixed).  What causes this?

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another_someone

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colours in stainless steel
« Reply #1 on: 31/07/2007 17:31:02 »
I am guessing that it is an old pan, that has seen a lot of scouring, and has lots of scratches that are causing diffraction.

Are you talking about bright colours, dependent on ambient light; or dull colours that are inherent in the material itself?

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Offline lightarrow

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colours in stainless steel
« Reply #2 on: 31/07/2007 18:37:24 »
Whilst doing the washing I noticed many colors on the bottom of a stainless steel pans(not in a rainbow, all mixed).  What causes this?

If you're talking about what I think, then the colours are due to a thin film of oxide with different tickness; this produces colours because of thin-layer interference (the same reason you see colours in a water pond with an oil stain spreaded on it).
Expert people can understand at which exact temperature a piece of steel (e.g. an engine's connecting rod) has been subdued, looking at those colours.
« Last Edit: 31/07/2007 18:41:37 by lightarrow »