How To Make Paper Into Parchment. Sulphuric acid, which changes cotton and other fibrous substances into a fulminating material, possesses also the singular property of transforming paper into parchment. To produce this transformation, take unsized paper and plunge it into a solution of two parts of concentrated sulphuric acid combined with one part of water withdraw it immediately, and wash it in clean water and the change is complete. It is now fit for writing, for the acid supplies the want of size, and it becomes so strong that a strip, two or three inches wide, will bear from sixty to eighty pounds weight; whilst a strip of parchment of the like size would only bear about twenty-five pounds.