Question: When things burn why is the colour redish-yellow, why not purple?

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  1. It depends on the chemical that is being burnt. so wood and plant material burns yellow-red, copper burns green colour, potassium has a violet / purple colour. This is how colours are made in fireworks. Have a look at this list on Wikipedia

    Some chemicals don’t have any colour. Like ethanol, it burns clear so you don’t know where the fire is. It can be very dangerous, because you can touch or walk into a fire you don’t know is there.


  2. Shona said it all.


  3. Yep, Shona explained this really well. If you want to see a cool video of different chemicals burning and showing different colours, follow this link: