Key Lime All Natural Water Soluble Flavoring. Ingredients: Natural Flavoring, Ethanol and Propylene Glycol. USP Kosher Grade Flavoring. Usage Rate 15-20% for E-use. No Refunds on Flavoring. Color Level: Clear. Independently laboratory tested Diacetyl free. Please Note: (Shake well before use). Natural citrus flavorings will vary from batch to batch because of the natural aspect of the flavoring, the season of the crop and the raw material that is sourced at the time of manufacture. Also natural citrus flavors can separate when mixed with glycerin and other base materials.