the scuffing works well and should be done, however germinating in paper towels is a bad idea all together. while yes it does work, the small seed with a tiny tap root exposed can stick to the wet paper towel and become damaged once pulled from the cloth. leaving it more vulnerable to infection or stunted growth. A easier way is after scuffing, matchbox works well, fill a small glass with distilled water and drop the seeds in the glass. roll them around gently between your fingers to pop the little air bubbles that attach themselves to the seed. leave overnight in a warm dark place and depending on the age and quality of the seeds the viable ones will sink to the bottom of the glass normally within 24 hours. And then generally within another day or two you should see the seed coat pop and a tiny white tap root should be coming out.