Can old drawn out frames and foundation of larger cell size be used as honey supers when you have downsized your bees?
Yes. But you loose interchangeability of combs. For large scale beekeeping it will be a pain to keep the combs straight. You could use them the first season and slowly phase them out. Or render them and trade the wax for foundation. I would definitely NOT use combs that have had miticide residue. Also one should use a queen excluder to garantee the queen won't move in the supers.