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C on stainless steel

I work in the watch industry and I am constantly looking for new finishes. I came across a PVD/CVD on stainless steel that changes colour according to the viewing angles. All I'm told is that the target is carbon. The PVD process produces a mono-coloured (blue) surface. The CVD process, carbon target with hydrocarbon gas, produces a finish that changes colours according to viewing angles, e.g. from orange to green. Can someone tell me more about the process?

w.y.wong
Mersey - Hong Kong
2000

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