Toner safe to use on hair extensions. Get vibrant and brilliant hair colour with Goldwell Colourance Soft Color 10V Pastel Violet Blonde 120g. The semi-permanent colouring foam is alkaline and oxidant-free, and increases gloss and colour vibrancy for up to 4-6 washes. Perfect for refreshing your colour in-between salon visits, our gentle formula is easy to use at home. Simply shake well, wear gloves, apply to towel-dried hair, comb through, and leave on for 5-15 minutes for desired depth of colour. Rinse thoroughly and enjoy your beautiful new colour.