Unions different color than parts

So, i’m working on an IS-2 mod. 1944 (tank), and i was starting to CSG some bits to get the part count down, and I noticed something.

Warning: kind of big image.

the slightly more more brown ones are the non-CSG parts, and the slightly more pink-ish ones are the regular parts/wedges.
I’m not sure what I did,
The material is Metal, and the color is sand-red

that’s because of tone shifting. it’s normal.

So, i take it there’s no way to fix it other than CSG everything?

you could set the CSG’s UsePartColor to true.

CSG colors are slightly different from the colors of normal parts, and the difference is bigger than tone shifting can account for. As Spacek said, you can check the UsePartColor property to true and it will put it the part into the normal color range.