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 follows the process of 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 different color leaves.
  • Remember that the plants undergoing photosynthesis have stored carbohydrates in them.
  • Performing an iodine test will prove that leaves other than green in color also have stored carbohydrate in them. Iodine, in the presence of starch, turns into blue-black color.
  • 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 also exhibits the process of photosynthesis. They have a 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