Marketing of science toys has tended to be heavily gendered, with the majority of scientific toy marketing being directed to boys, with occasional exceptions. A 1921 review of Chemcraft chemistry sets stated that "These outfits are more than toys. They are miniature chemical laboratories for boys and girls... this kind of play is most interesting and amusing to every youngster". In 1921, Chemcraft advertised a "Sachetcraft" set for girls that could be used to make perfumes and cosmetics. In the 1950s, Gilbert marketed a pink "Laboratory Technician" set for girls. It contained a microscope and factory-prepared slides, rather than the raw materials to make one's own slides for viewing. However, the manual contained identical information to that given to boys.