蛍光 けいこう増白 ぞうはく ざいじゃなかったです
keikōzō haku zaijanakattadesu

Noun
Desu Copula

The polite, past negative form of 蛍光増白剤

1. Wasn't a fluorescent whitening agent.; Wasn't optical brightener.

Past/Perfective
Negative
Polite
Casual Register