Once I needed a very small piece of material for an applique. I was not careful enough cutting it out along the salvage and accidentally left a small amount of salvage material on the piece. I never caught it until I was hand quilting around the applique. It definitely caught my eye as the weave was much different in that area. Thank goodness it was very small and could not be detected unless you were working closely in the spot. I always cut the salvage off as I am using the material but now carefully check to be sure I have removed a sufficient amount.