> It is uncertain when it went from purple to red, but it's likely a practical reason: when going outside you don't wear slippers but leather boots, which were very easy to get in a red color, purple? Not really. You can easily find purple used anywhere in clothing, but not shoes.
Wasn't the point of regal colours that they were scarce/expensive?
Scarse is good, for regal, but they do have to actually exist. Were there dyes that would work on leather at that time and yield the desired color and not wash off in 3 seconds and look like crap?
Wasn't the point of regal colours that they were scarce/expensive?