In the case of a method for testing the authenticity of purity of noble metal shaped bodies, in particular, bullion precious metal blanks the following process steps are provided and:Scanning of the total volume of precious metal molding to be examined by means of at least one ultrasound measuring system, for the determination of the homogeneity of the material of the precious metal molding on the basis of the measurement values measured during the scanning,– Determining the speed of sound of the precious metal shaped body at a plurality of measuring points with the aid of the ultrasound measuring system,– Determining at least one second of the speed of sound differing, material-specific characteristic value at the measurement points with the aid of the ultrasound measuring system,– Determination of the precious metal and / or the proportion of the noble metal of the precious metal molding by evaluating the speed of sound and of the material-specific second characteristic value by comparison with stored reference values.
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