酸素 さんそ けい漂白 ひょうはく ざいではありませんでした
sansokeihyōhaku za idewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 酸素系漂白剤

1. Was not an oxygen-based bleach.; Was not a type of oxygen-based bleaching agent.

Past/Perfective
Negative
Polite
Formal Register