The Source of Radiance: How Two Types of Glass Expanded the Horizons of Expression

At the core of Edo Kiriko's beauty lie the inherent properties of the glass itself. Historically, the glass used for Edo Kiriko can be broadly divided into two main types: soda-lime glass and crystal glass. When new glass manufacturing techniques were introduced from the West during the Meiji era, Japan began producing its own materials suitable for Kiriko.

Soda-lime glass, being relatively hard and lightweight, is a versatile material widely used for both commercial and everyday Kiriko pieces.

In contrast, crystal glass is softer and has a more substantial weight. It is this very "softness" that has profoundly unleashed the creativity of artisans. As one craftsman noted, "Without the introduction of crystal glass, the deep and exquisitely intricate patterns we see today would never have come to be."

Moreover, crystal glass possesses a remarkably high refractive index. When light hits the cut facets, it reflects and disperses complexly within the glass, sometimes creating a rainbow-like shimmer. By carving complex patterns—such as deep, sharp V-shaped cuts or the "Kikutsunagi" pattern, where fine, continuous engravings resemble a chrysanthemum flower—artisans create the magnificent sparkle unique to Edo Kiriko. This signature brilliance is a direct result of the material's physical properties.

Perhaps glass is not merely a passive recipient of the artisan's work, but an active partner, responding to their skill with its own inherent qualities and radiance.