My brother in law owns bees and gifts us honey. One is strong, thick, crystallised easily. One is thin and flows very easily, very see through. These things aren’t good indicators of adulteration at all
Unfortunately not. The rate of crystallisation depends on the source of nectar for the honey, I know from experience that clover honey seems to crystallise a lot sooner than Manuka honey.
It also depends on the sort of processing done. Commercial honey is pasturised, but local suppliers might not.