Glade expressions oil diffuser is a new stylish non-electric diffuser in an elegant design that can be placed anywhere. These diffusers can be used for both essential oils and fragrance oils, but essential oils are much thicker than fragrance oils and will not travel up the reed as effectively, so to aid in the dispersal, a little alcohol can be added. This is a very subtle form of diffusion, so bolder fragrances are recommended for maximum effectiveness.