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Law Summary
Margarine producers can’t make their margarine yellow.Why does this law exist?
From Wikipedia: In Canada, margarine was banned from 1886 until 1948 though this ban was temporarily lifted from 1917 until 1923 due to dairy shortages. Nevertheless, bootleg margarine was produced in the neighboring British colony of Newfoundland from whale, seal and fish oil by the Newfoundland Butter Company (which, in fact, produced only margarine) and was smuggled to Canada where it was widely sold for half the price of butter. The Supreme Court of Canada lifted the margarine ban in 1948 in the Margarine Reference.
In 1950, as a result of a court ruling giving provinces the right to regulate the product, rules were implemented in much of Canada regarding margarine's color, requiring it to be bright yellow or orange in some provinces or colorless in others. By the 1980s, most provinces had lifted the restriction, however, in Ontario it was not legal to sell butter-colored margarine until 1995. Quebec, the last Canadian province to regulate margarine coloring, repealed its law requiring margarine to be colorless in July 2008.