| 摘要 |
The different layers can pref. be provided as a number of coloured formations, and can be arranged widthways to each other on e.g. a self-adhesive tape, so that each is clearly visible to the human eye. A tape strip with a length of 5 cms thus provides a personal identity number, in which 10 colours are clearly distinguishable, even where some are merely shades of others, having a width of 5 mm. A variant arrangement is where the layers are arranged one on top of the other, so that each part layer has to cover that beneath it. To render the layers visible to the naked eye, or with the aid of a magnifying glass or microscope, each layer constellation takes the form of small particles. To achieve this, the coloured layers are painted on to each other, after which they dry and harden to a decomposable layer, from which colour particles are mixed in a solvent medium. Such a solvent should pref. have etching characteristics, at least on plastics material. |
