It depends on your vision of dark. Light Brown generally will not counteract red tones. Try Medium Ash Brown in a diluted formula for 5 minutes. ( Do a test strand!) If this formula is too dark try mixing equal parts Medium Ash Blonde with Medium Ash Brown and equal parts developer..then dilute this mixture by half with water and after applying all over, let it process only five minutes. ( Always do a test strand). If you need guidance call the customer service line for assistance.