Solvent Dyes basically do exactly what is suggested, as they are dyes (small particle size, maintaining transparency) which are soluble in solvents rather than in water. This makes them ideal for adding colour directly to any solvent-based products or any product dilute in a solvent. They are particularly useful in colouring fragrances or dilute fragrances or essential oils such as in reed diffusers. Suitable for colouring solvents and volatile oils including fragrance oils, essential oils and their diluents, which might include Denatured Ethanol (alcohol), Dowanol, IPM or DPG etc.. Ideal for use in Room Fragrance products such as reed diffusers.