I am moving out of my rented house in a week and I have repaired some minor nail holes in the walls. I need to do some touch up painting and was wondering what is the best way to get a sample of the color to bring to the paint mixing place? I can't think of anything but to take a picture(color might not match) or to try to chip off a piece large enough(i don't want to ruin the wall anymore than i already did).