Variation in colour or the presence of impurities does not generally affect the quality of the product.

The colour is influenced by light, the presence of nicotine and the preparation time: factors that determine the colour in a completely natural and expected way.

In the case of organic flavourings, some residue may be due to small lumps of concentrated tobacco that have not been perfectly solubilised, which is normal in the case of natural products.

As a rule, nothing needs to be done: in the case of organic flavourings, slight heating tends to make even these microdroplets of flavouring at higher concentrations pass into solution.