Joint textures.
As i know, when you upload a blue color on a left elbow joint texture, but you have, let's say, Gold force, the result will be a green elbow. The force color mixes with a color of the texture you upload.
We don't have this effect at bodyparts.
I discovered that if you upload a blue color onto Supernova force, you'll get the black force (just like Void), and blue relax.
I tried to experiment with other force/relax colors and joint texture colors combinations, but didn't get a Void force + green/yellow/purple etc. relax =(
I'd wonder if you know other colors that will give such result.
Please don't say "just invert your force color and upload it onto a joint texture". It doesn't work for some reason.
If you know some combinations, just share the toribash color (force/relax color), and RGB of the color which should be uploaded onto a joint texture.
Thank you!