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These print ads for shaving creams and after shave products are from the early to mid 20th century. Since they are from newspapers or cheap magazines, most of them are not full color. The two color ads are usually with black and red inks, since the red ink captures attention and can be toned down and mixed with grey to be flesh colored. The Barbasol ads in particular use that trick. The primary sales hooks were sex appeal and making shaving more comfortable.
These images, and those after the jump, are from the Duke University's digital archives. There are more at the link.