in my humbly slightly educated opinion (war history is a hobby of mine, so i dont have access to all these university papers, ID KILL TO SIT IN A GIANT ARCHIVE) but the Romans probably used red in the same manner as the Spartans did when it came to war.. To simply mask your own soldiers wounds and blood. and so that after battle youd only have to clean your armour and not have to replace your tunic thats soaked in blood.
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