Lead crystal glass:
It is consists of at least 24% of lead oxide, is marked with a label of suitable inscription and was invented 1675 in England with 36% of lead oxide admixtures. Lead crystal glass shows a high  light refraction and is suitable for decoration by engraving and grinding.

 

Lead glass:
It was invented from George Ravenscroft in 1676. The glass is provided with the addition of lead oxide.

 

Lump:
Is the gob, which is taken with the blowpipe from the furnace and is blown up to the parison.

 

Lustre:
A colourful shining decoration. She consists of metal oxides and is applied filmy with the paintbrush or spray pistol. It is burned in at relative low temperatures.