ANTI-PHOTOCOPYING PAPER AND/OR ANTI-TELEFACSIMILE PAPER

摘要

A B S T R A C TPaper is provided with resistance to photocopying ortransmission by telefacsimile by spatial spectral modulationof the paper reflectance at a specific single or preferablymultiple frequencies. Such paper has a coloured pattern of atleast two colours repeating in at least one dimension of a faceof a paper with at least one frequency in the range of fromabout 0.5 to about 50 times per cm. The colours contrast withblack or similar dark colour to permit black or similar darkcoloured information to be visibly readable when applied to thecoloured pattern. The colours also cooperate with suchinformation to provide a document resistant to photocopying andtransmission by telefacsimile.