From the 3/21 Dev Meet and Greet on Sakura (full transcript
here):
Mesanna: Greetings
EM Asiantam: about RB
EM Asiantam: simple question
EM Asiantam: why did you change their colors?
Mesanna: the issue was to enhance the art ankh and the outer edgings like the newer books
Mesanna: to make them when you dye then they are the same hues as the newer runebooks
Mesanna: it was not to cause isses with the older books
EM Asiantam: she is saying that she used to sort RB by colors
EM Asiantam: like
Mesanna: I get that
EM Asiantam: for Dull she added town runes
EM Asiantam: but
EM Asiantam: as you can see
EM Asiantam: they are now
Mesanna: and we all understand the old colors do not match the new ones
EM Asiantam: very hard to identofy
EM Asiantam: identify
Mesanna: you can dye those books
Mesanna: they will just be a different hue than the older ones
EM Asiantam: she is saying
EM Asiantam: this is worse in Classic
EM Asiantam: than EC
EM Asiantam: can you look into it?
EM Asiantam: so her question is
EM Asiantam: can you revert for Classic
EM Asiantam: not EC
Mesanna: we can look at the hues to see if they line up but we are not removing the art change
EM Asiantam: thank you
EM Asiantam:
Mesanna: most welcome