| 摘要 |
2071987 9116701 PCTABS00008 The invention relates to a process for producing colour change devices incorporating latent indicia and colour change devices incorporating latent indicia produced by the process. The process involves anodizing a colour generating metal (11), having limited surface areas thereof covered by a mask (12), in the presence of an adhesion-reducing agent in order to produce a colour-generating laminate incorporating an anodic film (13) having detachable and non-detachable areas (b, a). The improvement of the invention involves forming the mask (12) from a masking material which permits anodization of areas of the surface covered by the mask while preventing the adhesion-reducing agent from exerting a substantial adhesion-reducing effect in the areas of the surface covered by the mask. The anodic film having the detachable and non-detachable areas (b, a) can then be formed by means of a single anodization step carried out in the presence of the adhesion-reducing agent. It is therefore unnecessary to employ two partial anodization steps as in the past, which simplifies the fabrication procedure and makes the procedure less expensive.
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