"Mrs Housewife", the consumer, is deceived by other things. Supermarkets light meat with lights that make it look redder. Yet experienced buyers don't want steak that looks like that; they want it obviously aged. And detergents had a chemical added to make it foam, because consumers associated bubbles and foam with the detergent working, something which detergent for machines had little of, because foaming is not a good result in machines.
It is interesting that the British consumer wants brown eggs; no more logical, on the face of it, than wanting white ones. I prefer brown, too. They seem more 'natural', more 'free range' when they are nothing of the sort.