Japanese Crafts Online Media: KOGEI STANDARD
Gosu
A cobalt blue glaze containing cobalt oxide pigments. Gosu itself is a blackish mineral, but after reduction firing, the color changes to blue. Currently, it is difficult to obtain natural Gosu. Therefore, a compound that mixes cobalt and iron is being used prevalently.
Instructions for use
To use this product safely and comfortably, please follow the instructions below: