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What reaction occurs when benzaldehyde turns yellow under light?

2015-08-17View Original

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Benzaldehyde is rapidly oxidized to white benzoic acid under light; this reaction does not involve any change in color. So what causes benzaldehyde to turn yellow?
Reply #22015-08-17
The same substance can exhibit different colors in various forms, especially on the surface of the material. Some solid powders tend to turn yellow on their surface; this is likely not an issue related to the substance’s inherent properties, but rather an optical phenomenon caused by the surface texture. Just like diamonds, they are dark and dull when unearthed, but they become shiny after being processed
Reply #32015-08-17
Benzaldehyde is colorless and transparent when sampled; the longer it is left, the darker its color becomes (yellow)
Reply #42015-08-17
In the technology section, spamming is not encouraged; in-depth discussions like those above are welcome
Reply #52015-08-17
It might not be for the reason you mentioned @EvilReaped@ylb913
Reply #62015-08-17
Why is it like this? Is there any change?
Reply #72015-08-18
Will it have an effect if there are iron ions in benzaldehyde?
Reply #82015-08-18
Over time, benzaldehyde can be partially oxidized due to light and oxygen, resulting in the formation of some benzoic acid.
Reply #92015-08-18
Color is a characteristic resulting from the absorption of light by certain substances; it certainly contains other reducing or unstable impurities that cause color formation upon exposure to light
Reply #102015-08-18
Photodecomposition or photo-oxidation, and things of that kind – there must be a chemical reaction taking place! A colored substance has been formed; I hope someone downstairs can give an accurate answer!

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