I have a new client just contacted me for a cut and colour, for bleach and tone which is obviously no problem at all but she has told me she is allergic to methylchloroisothiazolinone also known as MCI and is also allergic to linalool. I've read up on these ingredients and they seem to be in everything! The first one is a preservative and the 2nd is natural found in oils and even foods. Does anyone have any experience with allergies to these ingredients I'm just trying to get as much info as I can before replying to this client. Thanks