Patent ID: 8325987

Claim:
An authenticity determination method, comprising: manufacturing a plurality of amorphous alloy members using a same mold, the plurality of amorphous alloy members including a first amorphous alloy member and a second amorphous alloy member, storing in advance reference characteristic information representing a characteristic of a first irregular region of the first amorphous alloy member that is an authenticity determining reference, the first amorphous alloy member comprising the first irregular region on a surface, the first irregular region having a center line average roughness Ra of about 0.1 μm to about 1000 μm, and the first irregular region comprising an amorphous alloy having an amorphous phase at a volume ratio of about 50% to about 100%; reading out determination subject characteristic information representing a characteristic of a second irregular region of the second amorphous alloy member that is an authenticity determining subject, the second amorphous alloy member comprising the second irregular region on a surface, the second irregular region having a center line average roughness Ra of about 0.1 μm to about 1000 μm, and the second irregular region comprising an amorphous alloy having an amorphous phase at a volume ratio of about 50% to about 100%; and comparing the determination subject characteristic information and the reference characteristic information when the determination subject characteristic information is read out, and determining whether the second amorphous alloy member that is the authenticity determination subject is authentic or not based on the comparison result.