Wratten #92 filter and IR photography.

[rusty71]

Digging through my basement tonight I found an old wratten #92 red gelatin filter.
I want to mount this inside my camera for infrared photography.
Does anyone know what the wavelength cutoff is for the wratten 92?
I see it is designed for densitometry use. Looks a lot like a #29 filter to my eyes.

 

[jd callow]

From what I could find it appears to block everything from ~610 and below.