My old photogenic powerlight 750 studio monolight strobes do give off some UV light.
So with the Pentax Q10 (and keeping in mind with the native lens, it's a leaf shutter, so shutter speed has very little impact on exposure here), I've tried a UV shot of one of my fountain pens, and an IR shot.
This is a Pelikan M640 Special Edition Mount Everest fountain pen, 18K gold nib, and has a sort of metal barrel with plastic grip, piston knob, cap and what not. While the barrel does look textured with the gold etching (it's a topographical map of Mount Everest), there is a clear coat of some sort of acrylic on the outside, leaving the barrel smooth to the touch.
For reference this is two visible light shots (shot a few years ago on the old Olympus E-P3 and an Oly 45mm f/1.8)
Then with the Pentax Q10, with just the IR cut filter removed (no glass put back in its place), using the 01 Prime lens. Both shots are done at 1/250th shutter, f/3.2 aperture, ISO 100 on the IR shot, and ISO 200 on the UV shot.
On the UV shot, the strobe was pointed directly at the pen from 3 feet away, full power. On the IR shot, since the camera was waaaaay more sensitive to IR (but more likely the strobe gave off way more IR light than UV), I had to drop it down to 1/4 power, point it up at the ceiling to bounce, and place a sheet of paper above the pen to further diffuse/darken the light.
The IR shot is using a Schott RG850 longpass (850nm+ deep infrared) filter in front, and the UV shot done with a LUV U II (UVA-only from about 320nm to 395nm with 360nm peak), both of which I got from uviroptics on ebay.
As you can see the clear coat on the pen blocks some UV light, but passes IR (and visible) light quite easily.
Also regarding exposure and difficulty lighting, with my conversation with Steve (uviroptics), photographing with UV light is a "dark world" as he says. Long exposure or specialized lighting is pretty much to be expected. Also from other sources (such as collective on UV photography forums, and other sources), it's said that nearly all consumer digital cameras, regardless of conversion method or even just naked sensors, can't see below 300nm, so any UV they do typically see is strictly UVA, there's some very narrow examples of UVB I saw out there, and extremely limited stuff for UVC out there (the world is pretty much pitch black below 280nm).
---------- Post added 06-14-2021 at 02:22 AM ----------
Btw this is a fireworks video shot with the Q10, no filter in front, just the 01 Prime. Can see quite of bit of the internal reflection.