When I worked at the airport, we'd burn jet fuel in our boiler to heat the hanger floor because we bought it at the same price as home heating oil. However, we never ran it in any of our diesel equipment. We had a diesel tank for those. Don't ask me why, because I have no idea. That's just the way it was.
Jet fuel was not dyed. Avgas was dyed. In some smaller private jets and turbo props we had to add Prist in the winter time, which was a fuel system icing inhibitor, and a micro biocidal fungicide. It was an aerosol can spray. You had to clip a little plastic nozzle onto the fuel nozzle and run a small flexible hose to the can nozzle. Then you had to inject the Prist into the fuel stream as you filled the tank over the wing. I do not recall the ratio, as it was 40ish years ago.
en.wikipedia.org
Prist is kind of a generic name, like Kleenex.
We didn't have to add it to jets that had the large fuel connections. I don't know why. I'd guess they had systems that would take care of fuel icing or perhaps a tank of something somewhere, but I never recall seeing that in the 6-7 years I was refueling aircraft.