8A will neutralise your blonde. Doesn't lighten your colour, but adds beautiful tones and depth.
Clairol Natural Instincts Semi-Permanent No Ammonia Hair Dye, 4 Dark Brown
Clairol Natural Instincts 6A Light Cool Brown
Clairol Natural Instincts Semi-Permanent No Ammonia Hair Dye, 9 Light Blonde
Clairol Natural Instincts Semi-Permanent No Ammonia Hair Dye, 5 Medium Brown
Clairol Natural Instincts Semi-Permanent No Ammonia Hair Dye All Shades Colour