Why you almost never see purple on national flags...

You have seen national flags with various colours, shapes and symbols but never a one with purple colour in it. The reason purple wasn't used in national flags was due to its high cost. Back in the day purple dye was worth more than gold because it was taken from a one species of sea snails in the Mediterranean sea. It took 10,000 of these snails to produce 1 gram of the purple dye. Purple colour garments were only worn by the people who could afford it, mostly the members in the royal families and hence purple became the "colour of royalty".

Incorporating a colour worth a fortune to a flag wasn't worthy but in 1856 the status of purple was forever changed when William Henry Perkin synthetically made purple dye. Purple became accessible to everyone after that and a handful amount of flags that were designed after 1900 have purple in them.

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