蛍光 けいこう物質 ぶっしつではありませんでした
keikōbusshitsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 蛍光物質

1. Was not a fluorescent substance.; Was not a phosphor.

Past/Perfective
Negative
Polite
Formal Register