硝煙 しょうえん反応 はんのうではありませんでした
shōenhanno udewa arimasendeshita

Noun
Desu Copula

The polite, past negative form of 硝煙反応

1. It was not a smoke reaction.; It was not a pyrotechnic reaction.

Past/Perfective
Negative
Polite
Formal Register