METHOD OF FORMING A SECURITY DOCUMENT
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United States of America
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Issued Date -
Jan 2, 2020
app pub date -
Jan 31, 2018
filing date -
Jan 31, 2018
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Abstract
A method of forming a security document includes: providing a security document substrate, the security document substrate including a security device including a colour shifting element and a light control layer covering at least a part of the colour shifting element, wherein the light control layer has a surface structure including one or more elevations and depressions that modifies the angle of light from the colour shifting element to generate a first optical effect, and; selectively modifying a part of the light control layer so as to generate a second optical effect different from the first optical effect.
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