Why are some plants purple or other colors even though they do photosynthesis? Shouldn't they be green?

Question

I don't mean flowers. I mean plants whose leaves/stock are different colors.

Answer 1

The chlorophyll (always green) is still present, it's just masked by other pigments in the leaf.

Answer 2

There are more than one kind of chlorophyll, and there are other photosynthetic pigments. If you extract these pigments from leaves and separate them using chromatography you will see that they are all slightly different colours.