noun which may take the genitive case particle 'no'
Typically used for flour, fabric, or other materials that have not been chemically whitened. Often appears in product labels or ingredient lists.
This bread uses unbleached wheat flour.
I chose unbleached coffee filters.
Compound of 無 (mu, 'without') and 漂白 (hyōhaku, 'bleaching'). The reading むひょうはく follows standard on'yomi.