unpigmented

adj

1. (not-comparable)Not pigmented.

   “Near-synonyms: pigmentless; undyed, nondyed, dyeless; uncolored, noncolored, colorless”

   “When the changes produced by congestion are visible, as in the eye, the nostril, the mouth, the genital organs, and on the surface of the body in white or unpigmented animals, the part appears red from the increase of blood[…]”