I would like to do some touch up painting to hide some stencil marks on my LR wall, but it seems when I did that paint job about 9 years ago, I must have used up all the paint, except for a small container, in which I added some white to it, to sponge on a paint effect. I wish I would have saved some for the future if needed from that, before I mixed that much! The paint is holding up real well, and I really don't want to repaint everything and responge too. It is a medium **** color. Is it possible to take a small chip off the wall, in a non obvious place, and take it to a paint store to match it up?