A little bit stuck with colour mixing ratio

[*Terri*]

hi everyone this is the first ever post so please bear with me.
Anyway my problem is a new client has approched me to colour her hair with Matrix 4N which is not a problem however i use wella and kadus. Could someone be able to help with the mixing ratio and whats the lowest strength peroxide in matrix? Im not that familiar with matrix.
Thanks Terri

 

[colorjunkie]

i actually use matrix socolor 4N on my hair and its equal parts developer and color, the lowest volume is 10, which is what i personally use...hope i helped!

 

[*Terri*]

Thanks x x