I fancy you won't be needing callipygian *that* often (I've only ever used it in sonnets, as far as I recall, but it's a wonderful word!), and I had to check on 'incarnadine' myself.

Glee. Piecing this together enlivened the minutes of waiting for *yawn* lectures on the Mathematics courses at sundry universities.

And of course, you have a proper icon for it.