Dipropylene glycol methyl ether is a slow-evaporating solvent and is an excellent fragrance carrier for reed diffusers. Add fragrances or essential oils to the base to make a product suitable for most room fragrance applications such as reed diffusers. As a guide, use 25% fragrance to 75% base, although this may vary due to personal taste and required strength. Shelf life is 2 years from date of manufacture. Vegan friendly and allergen free.