pigments

Hi I'm a first time grower. Today I noticed some weird pigmentation colors on one plants that started on one leaf and now have spread to several others. Is this something to worry about? Omer:thanks:

I've been doing a little bit of research on pigments, photosynthesis and adaptation. Since plants do have the ability to produce other pigments, is it possible to force the plants to produce primarily a different pigment that would make the plant look blue, orange or red by supplying only...