Will darken the color until the minimum desired luma difference is reached between the two colors
color:darken_based_on_luma_difference_between_another_color(STRING $hex_color_code, STRING $another_color_hex_code, INT $minimum_desired_luma_difference)
color:darken_based_on_luma_difference_between_another_color('160502', '000', 100)
#=> "#030000"
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