I'm a beekeeper. You might have noticed. In the long-ago, about this time of year, people would be leaving their bees to get on with it. But in the UK nowadays rape plants are commonly grown for the rape seed oil, and in the spring time these produce vast acreages of bright yellow flowers (I think it looks quite pretty: many people hate it). They are also very good for nectar flow, and produce large amounts of honey. But. The honey very rapidly granulates. So much so that you can't leave the bees to cap it over, it has to be taken out (about now; and perhaps again a few weeks later), spun out and bottled. If you don't, it just granulates in the comb and its uselss to the bees, and then you have to melt the comb down, which is messy and painful.
The photo shows a corner of a frame left in a bit too long (I should have done it on sunday, but we were in Oxford for M to take part in a piano competition (round 2). She came second (a close second we thought...)). Over on the right, the darker cells are liquid. Rightwards, paler brown are partly granulated; some white ones are solid. I spin it, most of the liquid comes out, put it back on a hive and hope the bees will turf some of the granulated stuff out. If you look closely, you can play spot the wax moth larva.