The butter-margarine dispute reached the US Supreme Court

Butter and dairy producers argued that margarine’s similar appearance could mislead consumers. Their campaign before lawmakers combined consumer-protection arguments with efforts to protect the economic position of the butter industry.

Several states responded with rules directed specifically at oleomargarine. Manufacturers and sellers faced dedicated taxes and licensing requirements, while some jurisdictions restricted the use of yellow colouring. The restrictions were intended to prevent margarine from looking like butter.

New Hampshire adopted a more specific measure. Its rule required oleomargarine sold as a substitute for butter to have a pink colour. The measure addressed the visual resemblance between the products by requiring the alternative to appear in a different colour.

The Supreme Court case

The issue came before the US Supreme Court in Collins v. New Hampshire. In 1898, the court ruled against the pink-colouring requirement. According to the account, the rule made the product artificially unattractive and effectively unmarketable, amounting to a disguised prohibition.

The ruling did not end regulation of margarine. Federal authorities and state governments continued to impose taxes, licensing arrangements and other restrictions for decades. In some places, margarine was sold white with capsules or packets of colouring, allowing consumers to create the expected yellow colour at home.

Margarine had attracted consumers as a cheaper alternative to butter, making its colour part of the wider commercial dispute. The yellow associated with butter became a point of legislative and judicial conflict when producers of the competing product sought to reproduce it. The pink requirement was overturned, but other measures limiting margarine’s similarity to butter remained in use.