I just started with 2 hives last year and made a couple of splits and ended up going into winter with 5.I checked the other day and 2 of the hives had frozen/starved out. When I was cleaning out what was left in the hives I noticed that some of the wax in a few of the frames was real dark brown while others were still light colored.What causes this coloration and should I reuse these frames this spring or start over?