| 摘要 |
PCT No. PCT/AU94/00723 Sec. 371 Date Apr. 12, 1996 Sec. 102(e) Date Apr. 12, 1996 PCT Filed Nov. 23, 1994 PCT Pub. No. WO95/14954 PCT Pub. Date Jun. 1, 1995Diffractive indicia for a surface (1) comprising a plurality of small separate diffractive elements (2) and means for a adhering the diffractive elements to the surface. Each diffractive element has a diffractive surface relief structure and is not separately resolvable to the human eye. The appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes. In preferred arrangements, the diffractive indicia, are incorporated in an ink or a transfer medium. A palette of diffractive indicia with different characteristic colours and other optical properties may be provided.
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