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Multi-tone watermark

A watermark produced by graded modulation of substrate thickness during papermaking, creating a range of light-to-dark tones visible in transmitted light; more secure than single-shade watermarks because tonal gradation cannot be simulated by printing.

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BOPP (biaxially oriented polypropylene)Cotton-linen substrateIntaglio printingKINEGRAMLatent imageMicroprinting / microtextOptically variable ink (OVI)See-through registerWindowed security thread

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