A Brief History Of Paper . Neathery de Safita (Neathery Batsell Fuller) July 2002. What Is Paper ? True paper is characterized as thin sheets made from fiber ...
Even using the simple watermarking method described, it can be difficult to distinguish some watermarks. Watermarks on stamps printed in yellow and orange can be particularly difficult to see. A few mechanical devices are also used by collectors to detect watermarks on stamps such as the Morley-Bright watermark detector and the more expensive Safe Signoscope. Such devices can be very useful for they can be used without the application of watermark fluid and also allow the collector to look at the watermark for a longer period of time to more easily detect the watermark.
This should not be confused with perceptual , that is, watermarking which uses the limitations of human perception to be imperceptible.
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