色・発色
colorant
Japanese: 着色剤
Metal oxides that impart color. They produce a vivid color even in small amounts.
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"Colorant" is a general term for substances added to glass to impart color. While metal oxides are primarily used, colloidal metals (gold, silver, copper) and rare-earth elements (neodymium, praseodymium, etc.) also function as color-forming agents. The final color is determined by the combination of the type and amount of colorants, the composition of the glass, and the firing conditions.
In glass fusing, transparency varies depending on the amount of colorant used. A small amount results in a transparent color, while a large amount may result in a translucent to opaque finish. Furthermore, combining colorants with opacifiers allows for the creation of colored opaque glass or milky glass. In color planning, it is also important to predict the resulting colors when colorants are layered.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.