🟣Purple flags are rare because purple dye was expensive and associated with royalty.
🎌Most flags in Europe and around the world do not include the color purple.
💰The cost of purple dye limited its use in flags, except for the papacy and royalty.
🌐Purple flags became more common after the creation of synthetic purple dye in the 1850s.
🇪🇸Spain is one of the few countries with a purple stripe on its flag, representing the historical association with Castile and Leon.