 It is a royal colour! Back in the old days, when people could only access natural dyes, purple was by far the hardest to obtain. They got the colour out of mucus glands of sea snails. Yep, snail mucus! More than 10,000 snails were needed just to make one tiny gram of purple. This was a time-consuming and expensive process, hence why the royals only decked out their rooms with this colour.