Pepper color (Bell pepper anywho) is determined by when the are picked. Green Bells are un-ripe, yellows a re riper, reds are ripe. Or that's what I've always been lead to believe.
Sorry, wrong Buck, yellow pepper are mutated so they don't make the red color, and never will get the color red, orange are in turn mutated yellow pepper and their ripe color will stay orange.
And no, I don't want caviar
TPBM wants to eat herring like a real dutch fisherman (raw, with grate and all)