Allergy Alert Test

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Allergy Alert test

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Allergy Alert Test


An allergy alert test (or patch test) must be carried out between 2-5 days before any colour service if you have not had colour in the last 12 months at Hatstand Nelly, or it is your first visit to us.

While the majority of people who have their hair coloured experience no problems, a small number of people have the potential to become allergic to some ingredients in hair colourants.

The hair dye PPD (paraphenylenediamine or p-phenylenediamine) is most often associated with allergic reactions to hair colourants. Among other things, this can also be present in temporary make up tattoos and can increase the risk of a reaction.

This can happen at any time whether you have had colour before or not and we hope you understand we will never put our clients health at risk and will always ask for this test to be carried out.

Tattoos/Permanent make-up


PPD is sometimes used illegally in so-called ‘black henna’ temporary tattoos. 

This can lead to a strong reaction to otherwise safe products such as hair colourants, which also contain PPD.

Certain substances found in some permanent or temporary tattoos and potentially in permanent make-up can also cause an allergic reaction. 

This can cause clients an increased risk of reaction when they have a hair colour, which means we need to check it is safe to proceed by carrying out an allergy alert test.
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