Step 1: 1. Select your noodles/pasta
Skip to step 5 if you just want to see how pasta turns out colored.

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for looking ,good
for eating,no,thanks
really looks nice!
probably not all natural, hehe. (but the howto still stands, you can use anything!)
Yellow: sodium chloride, E110 sunset yellow FCF, tartrazine E102.
Green: sodium chloride, tartrazine E102, Brilliant blue FCF (no E-number ...)
Red:sodium chloride,tartrazine E102, ponceau 4R E124.
Wiki on E102: http://en.wikipedia.org/wiki/E102
E124: http://en.wikipedia.org/wiki/E124
(is banned in America AND Norway - haha.)
E110: http://en.wikipedia.org/wiki/Sunset_Yellow_FCF
Brilliant blue: http://en.wikipedia.org/wiki/Brilliant_Blue_FCF
All except brilliant blue can induce allergic reactions.
There seems to be only one major study documenting the effects found.
Go natural if you can, wow.