I don't have any pics, and the kids have misplaced my current blacklight. I'll have to take some once I find it.
My current one is like this, different wavelengths from the tube and LED.
https://www.walmart.com/ip/6-Inch-Handheld-UV-Black-Light-Torch-LED-Flashlight-Portable-Blacklight-UV-Money-Detector-Stamp-Detection-Fluorescent-Marks-Certificates-Repairs/258626270?wmlspartner=wlpa&selectedSellerId=9600&adid=22222222227085181491&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=200762835355&wl4=aud-310687322322
la-326247045725&wl5=9060550&wl6=&wl7=&wl8=&wl9=pla&wl10=117430005&wl11=online&wl12=258626270&wl13=&veh=sem
My old one was one of these. Stronger, and more accurate wavelengths, but a bit expensive.
http://www.bapequipmentstore.com/ind..._detail&p=1523
There's a lot to see, how the different inks and papaers react to the UV, some light up, some don't. Most prewar paper won't. Some writing will, even if it's mostly erased, some stains, that sort of stuff.