Crumble is a type of BHO (butane hash oil), also known as honeycomb. The production of this wax begins much like shatter, however it is purged for a long time in low temperature in vacuum oven and whipped out during purging period. This results in softer consistency, yet is still brittle enough to crumble in the hands. Like other cannabis concentrates, crumble is higher in potency than flower, kief or hash