Because of the way dyes produce color, there is no such thing as white (the summation of all colors) and black (total absence of any color).
A good "black" is obtained by a mixture of 3-5 other colors, carefully ratioed to cancel each other out. This is why proper mixing is critical for "black" dye, more so than other colors. This is also why "black" dye is more expensive than other colors.
To my knowledge, no one has produced "white" dye.
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