Jisho

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Noun
1. dōsa; sizing solution made of alum and glue for treating washiUsually written using kana alone, See also 和紙
Other forms
礬砂 【どうさ】陶砂 【どうさ】ドーサ
Notes
礬水: Rarely-used kanji form. 礬砂: Rarely-used kanji form. 陶砂: Rarely-used kanji form.

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