Antique Stevens and Williams triple layer hock glass, green, amber and clear bowl.
This process is quite difficult and is achieved by blowing different colours of molten glass inside each other. The layers are then fused together. The process is laborious and different colours of glass can cool at different rates leading to cracking.
Once successfully blown the bowl is joined to the stem and base and the intricate…
Source : https://www.flickr.com/photos/captainchaoz/53159629868/in/pool-912056@N21