Gosu is a cobalt blue glaze containing cobalt oxide pigments. Gosu itself is a blackish mineral, but after reduction firing, the color changes to blue.
Kairagi is one of traditional techniques for Japanese pottery, originally for Edo chawan bowl which has a granular and crisp surface on the bottom of bowl.
It has a unique appearance created by the shrinking of the glaze.
In the world of tea ceremony, people have enjoyed its taste as "scenery".
When Yozaemon, the fourth generation of the Hyozan-gama kiln, presented pottery to Toyotomi Hideyoshi, who unified Japan in 1590, his technique was praised and he was given a red seal of approval and the surname "Hashiba". The kiln has a long tradition of pottery production.
height 2.4 inches (6.1cm)/diameter 5.7 inches (14.4cm)/weight 13.5 oz(380g)