Lot (8) vintage Czech red sintered glass beads

Lot (8) vintage Czech red sintered glass beads. These were hand made and vary in size and have color variations. Premium quality vintage Czech glass beads in excellent condition.
For collecting, making jewelry, fashion design, sewing, art and crafting.

Origin: Czech circa 1970's
Size: 13 - 15mm; 8/16" - 9/16" approx 
Material: Glass

Quantity: 8

Technology: Sintering is the process of forming a solid mass of material by heat and/or pressure without melting it to the point of liquification. The main component of sinter is crushed feldspar glass which, combined with other materials and fired in a mold at high temperatures produces a product that can not be achieved in glass by any other method. Coral effect beads are fired with wood in which burns away to produce the irregular bubble effect in the glass.
History: In the Jizera Mountains the company Gebrüder Redlhammer was the first to launch the industrial production of “glass-porcelain” beads and buttons. In the second half of the 20th century this production line was taken up by Preciosa, which also made sintered mosaic stones used on façades. At the end of the 1980's, Preciosa decided to stop producing sinter due to the rising cost.