Non-color applications in packaging design
Colors are divided into two categories: non-colored and colored. Non-color is black, white and from dark to the brightest variety of gray, they can be arranged into a series, called the black and white series, the series from black to white change can be expressed in a gray band, one end is pure black, the other end is pure white. The substance will be visible light all reflected, reflectivity equal to 100% for pure white; substance will be visible light all absorbed, reflectivity equal to 0% for pure black. In actual life, there is no pure white and pure black material, magnesium oxide can only approximate pure white, black velvet close to pure black.
Black and white series of non-color can only reflect the light reflectivity of the substance changes in the visual sense of bright changes.
When the surface of the print on the visible spectrum of all wavelengths of radiation reflectance are in 80% to 90% or more, the visual sensation is white. If the reflectance is below 4%, it is black. White, black and gray objects on the spectrum of the reflection of each wavelength is not selective, call them neutral features.
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