Purple Toning Duo (Purple Toning Shampoo 6 oz, Purple Toning Conditioner 6 oz) Maintain your silver and gray hair with a brightening duo that wards off yellow and help keep hair hydrated and smooth. Purple Toning Shampoo and Conditioner are infused with hair-enhancing, violet pigments that help tone down unwanted yellowing brought on by heat styling and sun exposure.