Optically Variable Magnetic Ink (SPARK®, OVMI)

Dynamic color-shifting ink developed by the Swiss company SICPA. Pigments of the magnetic ink used in SPARK® are oriented with the help of the magnetic field so that when the angle of illumination or observation changes, the image changes its color. As result, there is a rolling-bar dynamic effect (a beam of light moving diagonally across the image). Is applied by screen printing, contains ferromagnetic pigments.

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