Why is my Color plant only coming in green?

what exactly is your question?

Don't really understand your question. If you're wondering about the reason most plants are green, it is because they use chlorophyll to process the energy from the sun and nutrients from the ground, and water to make food. Chlorophyll is green.

Takes me back to 8th grade science class . . . Many many moons ago. Here you go!

https://www.researchgate.net/post/Why_are_plants_green

https://en.m.wikibooks.org/wiki/Biology,_Answering_the_Big_Questions_of_Life/Photosynthesis

If I have understood your question correctly, you want to know why your otherwise colored plant has turned green. Right? If it is a shade-loving plant such as a coleus or a begonia, it might be getting too much sunlight. Move it to a shadier location. The color will improve.

Or, if it's veriagrated it needs bright light