第7話: 瑠璃と海ガラスやシリカの色科学を探求しながら、翔子はお友達を見つける

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Schoolgirl Shoko loves rocks, but receives no support until she encounters Ruri and company investigating sea glass. We learn different ways for silica glass to gain colors, including by thin-film interference. A day of searching for old bottles on the beach gains Shoko new friends with a shared interest. Ruri learns that her name is an old word for blue glass. (Source: Wikipedia)