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                          Time:2015.12.29
                          1. What is light? The light emitted from the light emitter (source) out of the electromagnetic wave. Visible light is electromagnetic waves that can be perceived by the human e…
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                          Time:2015.12.30
                          Silk screen printing ink color 5) viewing conditions: color should be observed in standard light observed inside the photometer measured by spectral color spectral curves…
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