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In many states, the dairy lobby pushed through legislation prohibiting the sale of yellow margarine. These laws were repealed one by one, right up through the 1960s, with margarine manufacturers putting great emphasis in advertising on how wonderfully yellow margarine could be if the law would only allow it. And boy, was it yellow:

(Woman's Day, December 1949)
( Yellow, yellow, yellow! )

(Woman's Day, December 1949)
( Yellow, yellow, yellow! )