permanent white

Japanese: permanent white(英語表記)permanentwhite
permanent white

…When this solution is diluted with water, the barium sulfate precipitates again, and can be purified by this method. It is a beautiful pure white color, and does not discolor for a long time even when exposed to air, heat, hydrogen sulfide, or other harmful gases, so it is called "permanent white" and is an important white pigment. However, because its covering power is insufficient, it is often mixed with zinc sulfide or organic pigments. …

*Some terminology explanations that mention "permanent white" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…この溶液を水でうすめると硫酸バリウムがふたたび沈殿するので,これによって精製することができる。美しい純白色で,空気や熱,あるいは硫化水素その他の有害なガスにあっても長く変色しないから,〈不変白permanent white〉と呼ばれ,重要な白色顔料となる。しかし被覆力が不十分なので,硫化亜鉛や有機顔料と混用されることが多い。…

※「permanent white」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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