![FragranceChemistries850x425](https://img.cosmeticsandtoiletries.com/files/base/allured/all/image/2018/10/ct.FragranceChemistries425.png?auto=format%2Ccompress&q=70&w=700)
It is well-known that perfumes can affect the viscosity of bubble bath or shampoo formulations. Usually they have a thinning effect, but they can also cause a viscosity increase. The effect and its magnitude will vary with perfume type and also with the product formulation. Small changes in the latter can cause large changes in a perfume's effect on the viscosity.