Patent ID: 7186438

Claim:
A testing method for an optical information medium, wherein an anti-staining property and/or a fingerprint adhering property of the surface of the optical information medium which is on the incident side of a recording/reproducing beam is/are evaluated by adhering an artificial fingerprint liquid comprising a fine-particle-form substance and a dispersion medium capable of dispersing the fine-particle-form substance onto the medium surface which is on the incident side of the recording/reproducing beam, wherein the fine-particle-form substance includes at least one selected from the group consisting of silica fine particles, alumina fine particles, iron oxide fine particles, keratin fine particles, chitin fine particles, chitosan fine particles, acrylic fine particles, styrene fine particles, divinylbenzene fine particles, polyamide fine particles, polyimide fine particles, polyurethane fine particles, and melamine fine particles, and/or includes Kanto loam (JIS TEST POWDER 1), and wherein the dispersion medium is at least one selected from a higher fatty acid, a derivative of the higher fatty acid, terpenes, and derivatives of terpenes.