In the early 1900s, this colored-opalescent pattering was a popular Japanese glassmaking technique. However today, outside of select antique shops, glassware like this is exceedingly rare to find. The exact methods behind this glassmaking technique had become completely forgotten. Glassmaker Tatsuo Hirota though, through sheer trial-and-error, managed to resurrect this technique, which is called Aburidashi. 

Utilizing Aburidashi, Hirota-san designed these tumblers as part of his Taisho Roman series, in celebration of the early century's aesthetics. Today he is possibly the only glassmaker in the world producing Aburidashi glassware. Aburidashi patterning is produced by mixing in a special "bone ash" into the molten glass and then manipulating rates of heating and cooling while the glass is in its mold. 

The Taisho Roman Tumblers hold roughly 10oz and are sold individually. Two patterns are available.