METHODS OF CHANGING COLOR OF SURFACE-FORMING PORTIONS
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United States of America Patent
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Issued Date -
Feb 17, 2022
app pub date -
Feb 19, 2020
filing date -
Feb 19, 2020
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Abstract
To deposit a photochromic substance 3 on a surface-forming portion 1 of an object; and, when light in an ultraviolet range 5 is projected onto the surface of the deposited photochromic substance 3 to change the color of the photochromic substance 3 by photochromism, cover the deposited photochromic substance 3 with a wavelength-cutoff agent 4 that blocks wavelengths in an ultraviolet spectrum contained in natural light and/or illumination light.
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