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I've always wondered about a, but I realised last night, you could test the two liquids on your skin without mixing them, I think? Or just squeeze a little bit of each, mix in a pot and put that on your skin
Just mix a small amount of each together and put that on your skin rather than mixing the whole lot.
I could be wrong but I thought you were supposed to do a skin test every time, regardless of whether or not you've used that exact brand and colour before as it's possible to develop a sensitivity to it at any time.
Every single time Stick some on at 48hrs, and some at 24hrs - reactions are unlikely the first time of applying, if you only test at 48hrs, the second time is on your head! My friend had a horrendous reaction, she can't be near spices, newspapers, black jeans etc etc etc and she has drilled in to me how important it is after her whole life has changed
Behind your ear on the soft bit or inside of your elbow is best
Just take a very small amount from each tube and mix it. It does have to be mixed as you could be ok with the separate ingredients but react to the chemical reaction thst creates the dye. And you really should test every time as allergic reactions can take time to build up. hollin is right, reactions are rare the very first time as your body has to create the anti bodies
You do need to mix them, you can't test the two individually. And you are meant to do it every single time you dye - regardless of whether you've changed colour or brand or not. Also, they aren't conclusive, so you could still have a reaction during the actual dye, so make sure you don't ignore any signs of sensitivity if they appear once it's actually in your hair.