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Potassium dichromate test for alcohols. Both primary and secondary alcohols are oxidised by potassium dichromate (VI) solution, which is an orange colour (left). In the process, chromium is reduced from +6 oxidation state to +3 oxidation state. This is observed as a colour change from orange to blue (right), indicating the presence of an alcohol. The blue colour is observed after some time has passed, with the full sequence of colour changes over time being: yellow to green to blue.
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