Octaves have no color?
Suggestions past lavender
13a is neutral, and so purplish (much like 11a's lavender and the purple coming from equating rry1 and zzg3). Now there aren't many colours with a "th" in them, so I had to cheat a bit here. 13o is heather (I know it doesn't begin "th", but it'll have to do), 13u is thistle.
17a is close to ya, but slightly wider than yo and narrower than gu. Therefore, it needs colours that are slightly orange-yellow and slightly blue-green. 17o is sea, 17u is saffron.
19a is similar to 17a, and so needs similar colours. 19o is new leaf (probably should change to avoid clashing with nu, but I can't think of anything else), while 19u is nectarine. -- Jerdle (talk) 17:33, 20 October 2019 (UTC)