Excellent point.
The educated fleas could tell us, but they can’t see it.
However, when responding to a post that specifically says “350nm”, and not “10 - 400 nm”, it makes sense.
Purple-X (a term I remember being used in the 50s).
Ding. Ding. We have a winner!
Milla Jovovich.
“Beyond the Blue Horizon”
I think she’s Infra Red.
Beyond violet
Yep, Black light.