I have been going to a salon who switched to Inoa from Majirel color system.  Don't know anything about the chemistry of color, but can say that my hair is naturally a very dark brown.  I have lots of grey, but want to stay pretty true to my natural color.  After at least 4 times using the Inoa, she still can't get the color right.  I am at least 2 shades lighter and lots of copper.  The color fades within a week.  I have it colored every 4 weeks.  I am going tomorrow and she said she will use a 10 instead of 20.  Don't know what that means.  I like the stylist, and she is a Loreal trainer, so I have given her the benefit of doubt.  Should I give up on Inoa?