This medium-brown shade, often achieved through a double-process involving a base color and a highlighting tone, creates a rich, dimensional effect. The “4” typically represents a medium brown base, while the “27” indicates a blend of violet and red tones incorporated during the highlighting process. An example would be a rich brown base accented with reddish-violet undertones.
The specific combination of tones in this coloring process offers a nuanced approach to hair color, providing depth and complexity beyond single-process applications. It can complement various skin tones and allows for subtle variations in appearance depending on lighting. This coloring technique gained popularity as trends shifted towards more natural-looking highlights and multi-tonal color treatments.