STRETCH GLASS is basically the same thing as Carnival Glass. It is pressed glass sprayed while hot, with a solution of dissolved metallic salt(s), but with one more step added to the process. After the hot, shaped glass has been sprayed, it is re-heated. The metallic skin created when the iridescent spray bonded with the glass expands at a different rate than the underlying glass, and begins to striate, or break apart, causing stretch marks. Most stretch glass shows the underlying base glass color in the stretch 'fissures', but some glass is sprayed a second time to iridize the 'fissures'. Unlike Carnival Glass, most Stretch Glass objects have no embossed or intaglio pattern. Although some Carnival pieces exhibit stretch effect, it's because they were over-sprayed, not because they were reheated.