Crimp roses are an American invention, first developed in Millville, New Jersey at the Whitall Tatum & Co. Glass Factory. Ralph Barber is credited with creating this distinctive technique around 1905, using tooled iron or brass crimps. The rose is formed by pressing the crimp into a gather of both colored and clear molten glass, which pushes the colored glass into the clear glass, leaving behind a floral petal design known as a Millville rose.