Here’s an image I shot this morning on my IR-converted Pentax K-5 with the 43mm Ltd lens and a 720nm filter. Have at it! IRGP8799-Maalwater-43mm-720nm-ISO100.PEF (26.3 MB)
Generally you white balance IR using foliage, so it’s expected to be white, and with 720nm there’s only a very small amount of non-IR light getting through to the sensor
There definitely is a bit of color left in that channel and a bit of fiddling with the color contrast module as well as the color zones module can bring it out but I prefer my foliage somewhat desaturated rather than trying to pump up the minimal color info in that area TBH.