Getting Rid of Reddish tone

I am going to try to 'darken' my light blonde hair which is fine, and permanently colored. It's SUPPPOSED to be medium ASH blonde, but it never is anymore. I have this reddish tint in the front. I thought maybe going to a medium blonde might help, but then again, I could end up with the red tone. I read Silvie's advice (thank you again Silvie) on going to William's page and I did.Confusing as heck, but it seems I would need a color to cancel out the red/oraangy tones like with Blue green-blue violet. Does anyone know what shade of blonde (be it dark or medium or warm or gold) would cancel out the red? Maybe I'm all wrong and being anywhere in the "blonde" family will keep it REDDISH! Maybe a DARK ash blonde? medium just doesn't cut it anymore. HOWEVER, I'm not looking for BROWN.Thanks alot in advanceDeb