Theory:

Look at the picture below, there are different coloured leaves, isn't it?
 
Leaves_of_different_colours.jpg
 
Does leaves of other colours other than green also do photosynthesis?
 
Let us test the leaves which are not green in colour, whether they do photosynthesis or not.
  • Take one or more plants, one with green leaves and other with some other colour leaves.
  • As we know that plants undergoing photosynthesis have stored carbohydrates in them.
  • Now performing an iodine test will prove that leaves other than green in colour also have stored carbohydrates, iodine in presence of starch turns into blue black colour.
  • But if the leaf does not turn blue black on addition of iodine then it proves that the leaf belongs to a plant that does not do photosynthesis.
starch.png
 
Plants containing non-green leaves but still exhibiting photosynthesis contains non-green pigments known as anthocyanins and carotenoids in addition to chlorophylls. Anthocyanins present in large amount cover up the green pigments containing chlorophyll, however, the covered up chlorophyll continues to perform its function of carrying photosynthesis.
 
Reference:
Image credit :
Leaves of different colours : Wikipedia - https://commons.wikimedia.org/wiki/File:Leaves_of_different_colours.jpg