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What does the level system in hair color refer to?
The price range
The brand popularity
The lightness or darkness of hair color
The duration of the color
The correct answer is: The lightness or darkness of hair color
The level system in hair color refers to the lightness or darkness of the hair color. This refers to the depth or intensity of the color, with lower numbers representing darker shades and higher numbers representing lighter shades. Options A and D do not accurately describe the level system and are therefore incorrect. Option B may sometimes be a factor, but it is not the main determining factor in the level system.