Gutta-percha which has been thus treated (whether sulphuretted or unsulphuretted), becomes exceedingly smooth and of a lustre approaching to metallic: so also does common unsulphuretted caoutchouc (rubber) with the addition of being entirely freed from that stickiness peculiar to it, while sulphuretted caoutchouc acquires under such treatment, all the downy softness of velvet. * * * The _sixth_ part of the invention consists in producing a new compound of gutta-percha by mixing, in a masticating machine, six parts thereof with one part of chloride of zinc; and in forming new compounds of caoutchouc and jintawan by a like proportional combination. All these compounds admit of being afterwards sulphuretted or sulphurized. The _seventh_ part of the invention consists in an improved combination of materials for _producing a porous and spongy gutta-percha_, fit for stuffing or forming the seats of chairs, cushions, mattresses, saddles, horse-collars, railway carriage-buffers, and other like articles, similar to that described in the specification before alluded to; and in the application of the said improved combination of materials to the rendering of caoutchouc and jintawan similarly porous and spongy. The patentee takes 40 parts of gutta-percha, India-rubber or jintawan (moistened when a very light product is desired, with oil of turpentine, naptha, bi-sulphuret of carbon, or other proper solvent), 6 parts of hydrosulphuret of lime, sulphuret of antimony, or any other analogous sulphuret, 10 parts of carbonate of ammonia, carbonate of lime, or other substance that is either volatile or capable of yielding a volatile product, and one part of sulphur. He mixes these materials together in a masticator, and then subjects them to a high degree of heat, observing the same conditions in respect thereof, which are set forth in the specifications alluded to; except only that the heat may be pushed with advantage several degrees higher, say to from 260 to 300°. The _ninth_ part of the invention consists in producing by the combination of gutta-percha, caoutchouc and jintawan, with other materials, a fabric of a permanent lustre, resembling that of japanned goods, and in giving the like lustre to articles made of any of these materials in a sulphuretted state. The patentee takes the gutta-percha, caoutchouc, or jintawan after it has been sulphuretted, and either before or after it has been made into an article of use, and brushes it over with a solution of resin in boiling oil; he then places it for from two to five hours in a chamber heated to from 75 to 100° Fahrenheit; and afterwards polishes it by the means and in the manner usually adopted by Japanners. In some instances coloring matters are mixed with the Japanning materials, which are to be applied by blocks, cylinders, or rollers, in the usual way of floor cloth printing. RE-VULCANIZATION.