You searched for: “achromic
achromatic, achromic (adjective)
1. Without color; colorless; unpigmented: "Patty's achromatic skin appeared to be a result of her seclusion and being away from the outdoor gardens at the castle."
2. White, gray, or black in appearance: "Leland's achromatic photographs were very famous."
3. Transmitting light without any constituent color separation; such as, a lens: "The expensive camera was equipped with a specialized lens to allow Irving to take better achromic photographs."