| 摘要 |
Process characterized in that the paper, consisting of a homogeneous layer of cellulose-fibre structure, is thereby inked by means of any system (direct or indirect) on at least one of its faces with a photochromic ink which is invisible to the human eye but which can be activated within the spectrum of light sources which can be used in photocopying machines. Applicable to the papermaking industry. <IMAGE>
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