From shades of gray to denim blues, the most popular hair styles of late have been bold in hue.

[Here is my past trendlet about the denim blue hair rage.]

The trendlet

This fall, tresses are toning down as stylists are using balayage and old-school foil techniques to color the most narrow of narrow sections of hair, creating what they call baby lights. The result: more natural-looking blonds and brunettes.

Where does it come from?

Officially considered the child of highlights, the term baby lights was coined in 2014 by Jack Howard, a colorist at the Paul Edmonds salon in London. Howard realized that by concentrating color on petite slivers of hair, the roots wouldn't show as much when they inevitably grew out.

The technique is more about adding brightness than changing the shade, said colorist Leah Rogers of Suede Salon; in fact, most baby lights are just two shades lighter than the client's natural hair color.

But the color technique has become more popular - especially in the last year - as models like Karlie Kloss are sporting micro-colored tresses on magazine covers, and women are offering pictures of their little ones to stylists, wanting highlights that look just as natural.

These days, stylists also are combining balayage, highlights, and baby lights for the most dramatic of ombré looks.

Who is wearing it?

Actresses Natalie Portman, Naomi Watts, Jessica Alba, and Giselle Bundchen.

Would Elizabeth wear it?

I can't. Because of my locks, color will look more like balayage than baby lights.

Should you wear them?

Sure. Any coloring technique that cuts down on root maintenance or that brightens up your face is a definite go.

Model: Lindsey Brodowski.

Colorist: Leah Rogers of Suede Salon & Spa, the Promenade at Sagemore,

500 Route 73, Marlton,