History of The Symbol
Actual real skulls and bones were long used to mark the entrances to Spanish cemeteries (campo santo). The practice, dating back many centuries, led to the symbol eventually becoming associated with the concept of death.
In 1829, New York State required the labeling of all containers of poisonous substances. The skull and crossbones symbol appears to have been used for that purpose since the 1850s. Previously a variety of motifs had been used, including the Danish "+ + +" and drawings of skeletons.
In the 1870s poison manufacturers around the world began using bright cobalt bottles with a variety of raised bumps and designs (to enable easy recognition in the dark) to indicate poison, but by the 1880s the skull and cross bones had become ubiquitous, and the brightly coloured bottles lost their association.
Read more about this topic: Skull And Crossbones (poison)
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