硝酸 しょうさん繊維 せんい じゃありませんでした
shōsansen isojārimasendeshita

Noun
Desu Copula

The polite, past negative form of 硝酸繊維素

1. Was not nitrocellulose.; Wasn't nitrocellulose.

Past/Perfective
Negative
Polite
Terminal Form