I've been looking at the different things ya'll have made and they are beautiful. I've asked this question before, but I thought I figured it out and come to find out, I was wrong. So I'm back seeking help. A lot of the items I have seen have such a nice saddle tan or dark color, but the stitches are very white and gives a great contrast. How do you keep the thread white without it picking up color and becoming dirty looking? Any help would be greatly appreciated.