Blueing

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Hi All Came across this watch for sale for 4800 us dollars....
Can someone explain to me the blue transformation on the markers and omega symbol? Thanks
 
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Surface Oxidation: Microscopic layers of corrosion or tarnish on plated brass or nickel components can refract light like an oil slick on water, creating a blue or purple tint.

Plating Breakdown: The microscopic top layer of flash-plating or galvanic coating has worn thin or chemically shifted over decades of air exposure
 
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12
Quick Google search

Surface Oxidation: Microscopic layers of corrosion or tarnish on plated brass or nickel components can refract light like an oil slick on water, creating a blue or purple tint.

Plating Breakdown: The microscopic top layer of flash-plating or galvanic coating has worn thin or chemically shifted over decades of air exposure
ok thanks so its the plating that wares off. so the next stage could be rust?
 
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ok thanks so its the plating that wares off. so the next stage could be rust?
Usually the indexes are brass except on higher end models which may be gold. Probably just the surface plating thats affected
 
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Yellow Constellation indices are made of gold. Exceptionally ‘silver’ arrowheads are white gold but usually ‘silver’ arrowheads are rhodium plating over base metal.