When balayage came along, it was like all our hair-color prayers had been answered. Finally, we could kiss goodbye to tiger-stripe highlights and hello to softly sun-kissed, multidimensional color.

Katie Hale, head of colour at Charles Worthington, mentions that 3D balayage can often be a mixture of bleach to achieve the lighter strands and a darker hair gloss treatment. "Mixing the two tones ...