A method of preparing a metallic part using the following elements: - at least one graphic pattern; - at least a first container with a first fluid; - at least a second container with a second fluid; - a device comprising: an input (4.1) for capturing an electromagnetic signal captured through an input antenna (4.1.1) configured for capturing an emission radiation from a given object; an output (4.2) for applying an excitation signal on an output antenna (4.2.1) configured for applying an electromagnetic emission radiation on a given object; wherein the device is adapted for the amplification and processing of the signal received through the input (4.1) and, after the processing thereof, supplying the processed signal through the output (4.2); - a metallic part; wherein the method comprises: a) adding the at least one graphic pattern on the surface of the at least a first container with the first fluid; b) freezing the first fluid of the at least first container; c) placing the at least a first container with the first frozen fluid in the input antenna (4.1.1) of the device, and placing the at least a second container with the second fluid in the output antenna (4.2.1) of the device; d) putting the device into operating mode for a pre-established period of time, wherein the output signal of the device is established by amplification of the input signal; e) freezing the second fluid of the at least second container; f) placing the at least a second container with the second frozen fluid in the input antenna (4.1.1) and the metallic part in the output antenna (4.2.1); g) putting the device into operating mode for a pre-established period of time, wherein the output signal of the device is established by amplification of the input signal. - at least one graphic pattern; - at least a first container with a first fluid; - at least a second container with a second fluid; - a device comprising: an input (4.1) for capturing an electromagnetic signal captured through an input antenna (4.1.1) configured for capturing an emission radiation from a given object; an output (4.2) for applying an excitation signal on an output antenna (4.2.1) configured for applying an electromagnetic emission radiation on a given object; wherein the device is adapted for the amplification and processing of the signal received through the input (4.1) and, after the processing thereof, supplying the processed signal through the output (4.2); an input (4.1) for capturing an electromagnetic signal captured through an input antenna (4.1.1) configured for capturing an emission radiation from a given object; an output (4.2) for applying an excitation signal on an output antenna (4.2.1) configured for applying an electromagnetic emission radiation on a given object; wherein the device is adapted for the amplification and processing of the signal received through the input (4.1) and, after the processing thereof, supplying the processed signal through the output (4.2); - a metallic part; a) adding the at least one graphic pattern on the surface of the at least a first container with the first fluid; b) freezing the first fluid of the at least first container; c) placing the at least a first container with the first frozen fluid in the input antenna (4.1.1) of the device, and placing the at least a second container with the second fluid in the output antenna (4.2.1) of the device; d) putting the device into operating mode for a pre-established period of time, wherein the output signal of the device is established by amplification of the input signal; e) freezing the second fluid of the at least second container; f) placing the at least a second container with the second frozen fluid in the input antenna (4.1.1) and the metallic part in the output antenna (4.2.1); g) putting the device into operating mode for a pre-established period of time, wherein the output signal of the device is established by amplification of the input signal.