Because of the high level of detail that can be done by a master engraver , faking engraved designs is almost impossible , and modern banknotes are almost always engraved , as are plates for printing money , checks , bonds and other papers that should not be faked . Because of the high level of microscopic detail that can be achieved by a master engraver , counterfeiting of engraved designs is well-nigh impossible , and modern banknotes are almost always engraved , as are plates for printing money , checks , bonds and other security-sensitive papers .