Alcohol-based dye with oil pigment. ORM-D Flammable. (Formally Fiebings Professional Oil Tan Dye) Permanently tranform your leather with Fiebings Pro Dye! Pro-dye is an alcohol-based dye that can be combined with oil to thin your dye and condition your leather at the same time! This dye was developed specifically for natural strap leather, vegetable tanned leather and bag & case leather. With superior colorfastness and coverage, it's a must-have.