Colourstart do patch tests where you peel off the clear film and apply the colour sample almost the same way as applying a temporary tattoo. They are also great if you need to pop a patch test in the post to a client rather than driving to them (if you are mobile) or getting them in to the salon 48 hours prior to the colouring service.
They are available here: http://www.prohairandbeauty.co.uk/products.asp?cat=8651
But if you just google "colourstart patch test" -many other companies stock them!
Hope this helps xx
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