蛍光 けいこう増白 ぞうはく ざいじゃありませんでした
keikōzō haku zaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 蛍光増白剤

1. Was not an optical brightener.; Was not a fluorescent whitening agent.

Past/Perfective
Negative
Polite
Terminal Form