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Chrome reflector turns blue

We have a customer (powder applicator) who has been requested to re-coat some small infra red conservatory heaters. The coating has turned brown, the chrome protective wire cage changed to a bluish colour and the chrome heat reflector has been altered to a matte finish. These heaters are supposed to run at 200 °C - but what temperature did they reach to get into this state, or could running them for three months at 200 °C result in this defect?

Terry Hickling
Birmingham, United Kingdom
August 23, 2008

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