There are a wide of colors in useful comments votes:
Gray, Orange, Red, and Brown.
I know gray colors. all of the comments that have received a little up-votes have gray colors in their number of up-votes. in general, gray color represents little.
But I have no idea about other colors. for instance, I have seen a comment with 8 up-votes; another one with 31 up-votes and another one with 21.
the first one had a dark brown color. the second had an orange one and the third had a red tone.
If we assume the color intensifies with the up-votes increase, that 31 times up-voted comment should've had dark brown color and below it red and orange respectively.
So why is that completely different?