Whiter Than Snow

Riddle: What is whiter than the first snow, redder than the blood of the righteous, greener than the spring grass, bluer than a cloudless sky?

Answer: Light. These objects have different colors. But they differ from the standard, which is contained in the light spectrum.

Source: https://www.riddles.com/3347

What is whiter than the first snow, redder than the blood of the righteous, greener than the spring grass, bluer than a cloudless sky? — whiter than snow by Isaac Bickerstaff v1.

Riddle: What is whiter than the first snow, redder than the blood of the righteous, greener than the spring grass, bluer than a cloudless sky? Answer: Light. These objects have different colors. But they differ from the standard, which is contained in the light spectrum. — by Isaac Bickerstaff v2.