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You can use them to test dark clothing fabrics, to see if they will stain your doll. They can also be used to test chemical reactions (make-up, glue, etc) and to practice repair techniques, rather than butchering your doll as a test subject. Would also likely work as a compatible filler, if your doll gets a hole/tear.
It is also advised to set aside at least a small piece away from light and keep it dry and cool. That way if you ever need to match a head or a body and want the same color you have a sample that is not faded or discolored in any way! Trust me on this one!