This is a tiny graphics tweak for Factorio 2.0. The signals 0 through 9 were originally black on a light blue tile background. In the latest versions of Factorio (v2.0.60+) these numbers are white text on a dark tile background, and they look a LOT like constant integers selected at the bottom of the signal chooser.
I am constantly confusing the signals 0 and 1 with the constants 0 and 1 (they are not the same.) So I have tinted the digits in the signals 0 through 9 to have a light pastel tint, to help me distinguish them from integer constants which will still appear as white.
This mod was inspired by KatherineOfSky.