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Volume hologram with expansion agent layer or contraction agent layer to produce color patterns
Volume hologram with expansion agent layer or contraction agent layer to produce color patterns
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机译:具有膨胀剂层或收缩剂层的体积全息图可产生彩色图案
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摘要
The invention concerns a security element in the form of a multi-layer film body having a volume hologram layer with two different items of optical information and a process for the production of such a security element.
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