Popular Mechanics, maaliskuu 1924
Colors of every tone and shade, to the number of 1,4000, are displayed in an index recently issued. There are no duplicates in the list, which was compiled from the productions of dye makers all over the world. Many scores seem exactly alike to the eye, but tests show that they are not. America sent samples from twenty-nine factories, while England and Germany were each represented by thirty-two.