Re: Antonym of 'evanescent'?

In article
<63be066c-9ee8-4916-80e9-528ef9dda1b4@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
rge11x <rge11x@xxxxxxxxxxxx> wrote:

On Dec 18, 12:18 pm, AES <sieg...@xxxxxxxxxxxx> wrote:
What is -- or should be -- the antonym of 'evanescent' *in optics*?

["Temporary" and "permanent" just don't do it.]

Tumescent?

That is an "insanely great" suggestion! (to allude to a well-known
computer figure).

But I'd suggest that "tumanescent" might do the job as well, and avoid
certain -- ahem -- potential editorial objections in serious technical
publications.

Who is "rge11x"?
.