An electrically operated slicing machine for cutting slices from product has cutting device with a circular knife mounted in a machine housing that rotates in a cutting plane and a substantially flat support plate having a support surface for placement of the carriage carrying the product. Both probiotic microorganisms and the carrier of the probiotic microorganisms in form of a fermented cereal gruel are used as treatment effectors. The method provides low-temperature removal of graphene layer-by-layer.