The color of numbers?

[AnimeJet]

0 & 1 - Black or white
2 - Blue (>_<)
3 - yellow
4 -purple
5 - black
6 - yellow
7 - green
8 - black
9 - n/a
10 - white with black outline.

Out of the colored ones, i can only make sense of #2, everything else... dunno.