butter and margarine were both in short supply and subject to rationing in the United States, but butter required more points, causing margarine to gain popularity. In 1951, the W. E. Dennison Company received US Patent 2553513 for a method to place a capsule of yellow dye inside a plastic package of margarine. After purchase, the capsule was broken by pressing on the outside of the package, and the package was kneaded to distribute the dye.

The artificial coloring laws began being