Matrix 6A turned green?

[Alayni]

Used matrix 6A so color on a client to break up blonde balayage from previous hairdresser. (Foiled) Turned green on blonde ends. Any idea why? Or how to get rid of it?

 

[Lauraa1981]

would say that you need to add a little copper to the 6. When going 2 shades or darker the hair needs to he filled or it goes green or muddy. NEVER use ash when darjening more than 2 shades. For a level 6 need to use copper or gold in your natural. Look at the levels and see what your target level is and see what colour you beed to add to fill the hair so it doesnt go muddy or green. To fix it try adding 6.66 on the roots it should nutralise it.