Jan 28 2012: Do you remember Heinz coloured ketchups (including green ketchup)? They were failures because of artificial colourings are off-putting, let alone blatantly obvious ones and with such a "natural" craze currently happening in food products I doubt re-introducing complementary coloured condiments will be successful, at least in this decade.
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A comment on Conversation: Purple-colored mustard (in purple containers)