Eliza R. Snow publishes a poem that uses "blackness" as a synonym for "rottenness" and "corruption."
Eliza R. Snow, "Missouri," Times and Seasons 5, no. 3 (February 1, 1844): 430
What aileth thee, oh! Missouri! that thy face should gather blackness, and why are thy features so terribly distorted?
Rottenness has seized upon thy vitals— corruption is preying upon thy inward parts, and the breath of thy lips is full of destructive contagion.