Soft set honey, or what is sometimes called Butter Honey, is honey in which the granulation has been controlled. A small amount (~10%) of granulated honey with a soft, fine grain, is added as a ‘seed’ to liquid honey. As the latter granulates, it takes on the consistency of the seed honey. It should have a smooth consistency, almost buttery as it spreads.
Granulated honey, also known as set honey, is honey that has naturally formed crystals. It can take from weeks to months for liquid honey to crystallise and set solid . Crystallisation is not a chemical change, but simply a physical reordering of the molecules.