Guerlain Two-Tone Blush Duo 3 Corail Doux 6.5g. Guerlain has reinterpreted Makeup artists’ draping technique with the creation of its first Two-Tone Blush – a blush and highlighter duo – for professional application, in a single step. The integrated powder puff is perfect not only for easy application in just one stroke, but also for a more blended finish. How to use: Smile and use the powder puff to apply the highlighter to cheekbones and the coloured blush to cheeks for a perfect make-up result in a single step. Blend as needed.