When Crayola‘s senior designer Emerson Moser retired in 1990—after 37 glorious years of loyal service—he finally confessed to a little secret: he was color vision deficient! Moser went on to produce a record 1.4 billion crayons during his career…
While any type of color vision deficiency (color blindness) could make crayon production difficult, complete color vision deficiency, where someone can only see in shades of gray, is extremely rare. About 99% of color vision deficiency involves just the inability to distinguish between some pairs of complementary colors.
So, if you’re wondering about your own color vision, feel free to take the test on my website.