The patch test described in the L’Oreal Excellence instructions say to only use the colourant part of the hair dye as it contains the para-phenylenediamine (PPD).
A small disclaimer – The photos used are of my arm. At the time I was taking some prescribed medication for migraines, hayfever nasal spray and over the counter antihistamines Zirtek. I do get eczema, I have no tattoos, I have never smoked and I have never had any henna tattoos.
Here is the skin allergy patch test. The patch test itself took no more that a few minutes to do and the drying time was between 30 minutes and 1 hour.My inner elbow before the patch test
The tube is clearly labeled.
Undo the lid and pierce the foil seal with the pointed section on the top of the lid. There is a bit of yellow coloured liquid which comes out first. This is not what you use for the patch test – this prevents any oxygen getting to the colourant and the colourant from degrading. It is the cream coloured creme that is used. Squeeze a small amount onto a cotton wool bud
and apply it in a 10p size to the inner part of your elbow or behind your ear.
This is how my arm looked immediately after applying the colourant.
A little bit of redness and the rest of the arm is normal for me.
This is an hour after I had let the colourant dry.
It is visible to see something going on. It did initially sting a bit but this went off. The left over dried bits of colourant were gentle wiped off.
After 24 hours this is how my arm looked.
Apart from an impression from the sleeve I was wearing – it was absolutely clear. After the 48hours my arm was still clear.
All the photos I took for my 48hour patch tests are on my twitter account.