One can argue for thin-film interference of protective oxide film (that has varying thickness) that have been eroded-corroded to various thickness. But why does this pattern last long? Does oxide film fail to form/grow to full thickness on the burnt region? even when the material is removed from heat source, the patterns still remain. And unlike thin-film interferance with varying thickness, The oxide film does not show any sort of VIBGYOR trend with temperature . Why does that happen?
To form an oxide film, the metal has to react with oxygen. When an organic molecule on the metal surface is pyrolyzed, it consumes the available oxygen and prevents oxidation of metal. Only when the organic substance is fully decomposed (to carbon dioxide) and completely leave that surface, the metal will oxidize. Adsorption of carbon mono oxide on the metal surface will also prevent oxidation!
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