Yes, white is easier to see the seam through than darkroom colors . Very often you can press away from the white, but if you can't, make sure that there is not also a bit of dark fabric showing behind the white. What I mean is if the white is joined to a dark, and you have to press the seam toward the white, sometimes if your seams are not matching absolutely dead-on, you'll see a sliver of darker fabric sticking out behind the white seam, and that will REALLY show if you don't trim it off a bit.