I have a client who i did a global colour on for the first time about 8 weeks ago i did 6.0 majerel and 20 vol as about 50 % grey she wanted the best match possible so she said she really like about 2 weeks ago she rang up to make an appointment for another colour she said it was a tad to dark so this time am thinking 1/2 of 6.0 and 1/2 of 7.0 20 vol on roots and combed throught for 15 mins with the same but with 30 vol does this sound ok ? I know its a simple 1/2 shade lighter but she suffers from depresion want to get it exactly right this time x