The LOC does not have a technicolor print. They have copyright deposit prints on the standard film stock used for each regular printing of the OT films. I don’t have time to retype the whole story again but a number of years ago I was able to visit the film storage vault in Culpepper, VA and see the prints in person.
Star Wars looked like a regular release print that had been shown in theaters prior to being sent to the LOC and had all the usual wear and tear of a theatrical release print. It was faded to a light pink but still had enough color info for the telecine operator to color correct it with relative ease.
ESB also looked like a release print and was sadly as red as a cherry, though with today’s tools you could probably still pull out decent colors.
ROTJ looked brand new like it was struck yesterday. No noticeable print damage and beautiful vibrant colors.
The prints have since been elevated to a preservation status that means it’s basically impossible for the public to access the actual prints anymore. The author of that article above saw a copy of Star Wars that was made via a 2K telecine which was completed sometime after my visit (it was in a pipeline of upcoming projects when I was there). It’s my understanding anyone can go to the LOC in D.C. (not the film storage facility) and request to view that copy but you have to sit and watch it there on whatever player they provide. Which, honestly, is rather pointless these days with the existence of 4K77.