First of all, an expert glassblower blows clear glass into a paper-thin shape of colored glass and then rotates this in the air to make the overall form. The result is a two-layer structure with colored glass on the outside and clear glass on the inside. By cutting patterns into the outside surface with different kinds of whetstones, a vivid contrast is created between the colored glass and the transparent glass.
In 1985 Edo Kiriko was designated a Traditional Craft Industry by the Tokyo Metropolitan Government.
To qualify as a Traditional Craft Industry, the Tokyo Metropolitan Government stipulates that the main process of manufacture must require the expert manual skills, the history of the techniques used must date back at least a century, and the craft must use traditional materials.
Edo Kiriko of working process