Dark Cloud - Cotton Purple -
Black glass called "Uwaguro (upper black)" is a color which is difficult to bring out its personality.  
By melting it with translucent white glass, I succeeded making quaint glass beads.  When this glass is stretched thinly, I can see that the actual color is dark purple rather than pitch black.  
These beads which look like ink mixed with milky white water, are popular among foreigners as they have old Japan atmosphere.  
To make it easier to remember, we gave it the modern name of "Cotton Purple".