Not all permanent cosmetic colour ranges are created equal.  But what criteria defines a high quality permanent hair colour?

• The range should use ultrahigh-quality micro-pigments.  The smaller the size of the colour pigments, the better the penetration into the cortex prior to oxidation.

• The colour pigments used should be free from mineral impurities to ensure excellent stability as well as colour duration.  You would not want any minerals effecting the end result that you are hoping to achieve.  Minerals, especially lead and aluminium, may furthermore causes allergic and chemical reactions.

• All colour pigment molecules should be used during the colouring process, without waste, as any remaining pigments may alter the final result.  Most colour houses use actual weights of red, blue and yellow pigments in different ratios to obtain the nuances.  This, however, will lead to incorrect results as the pigments themselves are of different sizes and weights.  As a result, the weight of e.g. red pigments will lead to more molecules than required, as the red pigment molecule is smaller and lighter.  A Stoichiometric weighting system is more accurate.  This measures the actual number of molecules instead of the weight thereof, leading to more accurate ratios and more stable nuances.

• All colours, especially fantasy colours, must already contain a component with a natural base.  This means that the colour does not have to be further mixed with a natural to obtain grey coverage.  It can be used as is.

• It should have a delicate formula, free from p-Phenylenediamine (PpD) to ensure better scalp tolerance.  Look for brands that uses paratoluenediamine (PTD) instead of PpD, and for formulations with added Aloe Vera, to sooth scalp sensitivity.

• If possible, look for brands that include natural oils and keratin in their permanent colour.  The oils maintain the moisture of the hair while the keratin protects the structure of the hair during the chemical process.  Good quality oils will also leave the hair with softness and shine.

Both the Inebrya and Bionic permanent colour ranges meet these criteria and is recommended to professional salons to ensure 100% grey coverage and colour durability.