?????? ???? ?????????; ????????? ????? ???? ? ?????????? ??????????.? ???? ????????? ??? ???? ??? ?? ??? ??????? ??? ?????????.Through the late 1800s, new additives ended up mixed in. and glass was now re-heated just after manufacture inside of a Unique oven, then flattened and affixed to the bit of polished glass which preserved its surface area.I