| http://www.w3.org/ns/prov#value | - The security feature 16 can take the form of various interference devices, such as optically variable inks, pigments, or foils including color shifting inks, pigments, or foils; bulk materials such as plastics; cholesteric liquid crystals; dichroic inks, pigments, or foils; interference mica inks or pigments; goniochromatic inks, pigments or foils; diffractive surfaces, holographic surfaces, or pr
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