Here's how and why you need to patch test for allergies before you colour your hair
How the colour process works
One of these commonly used chemicals you may have heard of is PPD (listed in ingredients as Paraphenylenediamine). While our Permanent Colour Kits and Shade Shots (that are applied with the permanent colour) do not contain PPD, they do contain an ingredient called toluene-2,5-diamine sulphate, also known as PTD.
How to patch test at home?
- It's important to perform an Allergy Alert Test each time you colour your hair, even if you’ve used at home hair dye before and had no reaction, as skin can develop an allergy over time.
- An allergic reaction can consist of itchy skin, redness or even blisters on your scalp, so it’s really important to do a patch test to avoid these. DO NOT use the product if you experience any reaction.
- Mix a coin-sized amount of the colour formula (A) and activator (B), plus the same sized amount of the Shade Shot Plus (if adding for a personalised finish) and mix together in a bowl.
- Tip: It’s very important to fasten the caps on the bottles tightly after you have opened them for the Allergy Alert Test, to prevent the products oxidising and ensure the active ingredients will work after the test. Once products are mixed, they cannot be kept and should be disposed of carefully.
- Use a cotton bud to apply a small amount behind your ear. Or use a cotton wool pad wrapped around the pointed tip of the colour brush in our Accessories Kit.
- Leave it on for 48 hours before washing off. You shouldn’t even notice it’s there, there may be a tiny dot of product residue visible but no marks or redness if your test is normal.
- If you have any signs of reaction, wash it off immediately and do not use the permanent colour. Please do contact us if this is the case and we will happily refund you for the product as you cannot use it.
- If you show no signs of reaction to the dye, it is your all clear to go ahead and use your perfect shade match as instructed.
- If you have any further questions on Allergy Alert Tests please do get in touch on firstname.lastname@example.org or in the comments below.