Before you try toning it yourself try a silver conditioner, they are far more effective as they are designed to lay on and in between the cuticle layers of the hair. Leave on for 5 mins before rinsing and do it each time you shampoo your hair until you feel you have achieved the colour you want. ...More >
Then you should only have to do it every couple of weeks for maintenance. If that really doesnít work for you , yes a goldwell toner of an ash or violet base mixed with a no peroxide developer for 15 mins should do the trip. Make sure you also use colour save shampoo as it does help with the longevity of these type of toning solutions.