I figure there are enough artists here that someone will know the answer. I bought a generic set of pastels. Fine Touch brand, no big deal. They are about 3 inches long and rectangle. How do I tell if they are soft, or hard pastels. I think they are the hard but I'm not sure. I want to purchase a set of soft pastels but do not want to end up with more than one set of the same type. How can I tell?