Which colour of M&M's has the least artificial chemicals and colours?

Which colour of M&M's/Smarties has the least artificial chemicals and colours?
Because when I'm eating them I always eat by colour. I was wondering, if I were to only eat 1 colour; which one would be the healthiest for me? I mean; isn't red a carcinogen?
Same applys to smarties.
Thanks!
 
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