Unscrew the applicator bottle which contains the developer, do not remove the tab.
Unscrew the hair colour tube and mix a small amount of the colourant and developer in a plastic bowl. Re-seal both bottles carefully.
Use a cotton bud to apply the mixture to a test area approximately 1cm² in the bend of your elbow. Allow to dry. Do not wash the area for 48 hours. Protect with a waterproof dressing during washing, remove immediately after washing. If a rash, redness, burning, itching or any other reaction occurs during the test you may be allergic. YOU MUST NOT USE THE PRODUCT.
The test represents an important precaution. However, be aware that even if an allergy alert test has been carried out you may still experience an allergic reaction when you colour your hair. The allergy alert test is not a guarantee of avoiding future allergic reactions. Please consult your doctor if you have any doubts.