How was the purple ink in medieval manuscripts made?
From indigo
From purple-blue rocks found in the mountain ranges of Scotland
From the blood of sea snails

I think it was made from the blood of sea snails, specifically the Murex snail. this ink was also used to dye clothes (especially royal clothes) and other things!

hope this helped!!

yellow and blue because thats what i remember, im not sure tho

i believe their role is to instruct certain sections on when they are to join and when they are to stop