1) How can you avoid contracting contact dermatitis during a colour service? 2) Why are skin tests conducted prior to a colour service? 3) What is the outer layer of the hair shaft called? 4) Why do we do a porosity test? 5) Why do you need to wear PPE? 6) Does your client need a skin test before a Quasi colour application? 7) What is the correct mixing ratio for a vibrance quasi colour? 8) Which is the darkest, a 3-0 or a 9-0?

Colouring Level 2 recap starter Quasi

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