%achromic%

a. [ Gr. &unr_; colorless; &unr_; priv. + &unr_; color. ] Free from color; colorless; as, in (Physiol. Chem.), the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine. [ Webster 1913 Suppl. ]