Redken hair color

Hello to anyone who can help please....I usually got a friend who was a hairdresser colr my hair at home....she's sinced moved away and we lost touch ....I loved my color and have neck problems and can't go to a salon,..I believe she used redken fusion. ..red tube black top...but don't know the color....it was a beautiful brown with some mocha....not too dark...I tried dying it with medium ash but it doesn't look the same...I don't want to go to dark I'm naturally a medium ash brown but the redken looked so rich I wanted to order it and do it myself but don't want to mess it up....Can anyone tell me where to find a redken color chart?