Analysis of information sources in references of the Wikipedia article "Handkerchief code" in English language version.
In San Francisco, the signs began appearing around 1971. The Trading Post, a department store specializing in erotic merchandise, began promoting handkerchiefs in the store and printing cards with their meanings. The red and blue handkerchiefs and their significance were already in existence, and meanings were assigned to other colors as well.
In San Francisco, the signs began appearing around 1971. The Trading Post, a department store specializing in erotic merchandise, began promoting handkerchiefs in the store and printing cards with their meanings. The red and blue handkerchiefs and their significance were already in existence, and meanings were assigned to other colors as well.
