Add 1 - 2.5 ml of Essential oil or Fragrance per 500ml of base. You will notice some Fragrances and Essential oils will make bases *watery* - you can use our Liquid Shampoo Ultra Thick to thicken it again at between 1 - 3% (ie 5g per 500g of base).
Please note, our shower gel is now slightly thicker. If you use this for foamies, it may now be a little too thick - we have introduced our special Natural Formulation Bubble Bath for Foamies (and Bubble Baths).