Some modded examples:
1) The blue cube is the first layer and does not get tinted. The blue cylinder and the "1" digits are layers 2 and 3 and get tinted.
2) The grey cylinder is the first layer and does not get tinted. The grey dot on top is layer 2 and gets tinted.
Yes, I know that "Icon layers are borderline unusable except for the case in vanilla for which they were added (barrel recipes)" but this *does* affect barrel recipes, so surely it's of interest?
