Hair vibrancy: A quantitative multi-modal approach bridging consumer perception, expert and instrumental evaluation.

OBJECTIVE Consumers increasingly seek vibrant, healthy-looking hair characterized by enhanced shine, colour longevity, smoothness and optimal fibre alignment. This attribute significantly influences self-confidence and aesthetic satisfaction. However, the beauty industry lacks standardized, quantifiable parameters for measuring hair vibrancy, creating a critical gap between consumer expectations and scientific validation. This study aimed to establish a standardized, quantifiable framework for assessing hair vibrancy by integrating consumer perceptions, expert evaluations and instrumental analyses, thereby bridging the industry's measurement gap.

MATERIALS AND METHODS We characterized hair vibrancy by integrating consumer perception (n = 24, across two age cohorts), expert evaluation and instrumental analysis. The investigation used internal hair colour formulas shade 3 (dark brown) and fashion shade 6 (cherry red) on grey hair. Instrumental analyses included spectrophotometry for L* values, BNT lustre measurements for shine and the Dia-Stron MTT175 for smoothness and fibre alignment.

RESULTS Strong in vitro correlations (r = 0.86) were observed between instrumental and expert assessments for colour and shine. Instrumental studies on treated versus untreated hair further demonstrated product impact on colour, shine, alignment and smoothness.

CONCLUSION Hair vibrancy is operationally defined as a multidimensional perceptual attribute, integrating luminosity (colour/shine), structural integrity (smoothness/alignment) and apparent vitality, perceived visually and tactilely. These findings provide a robust framework for understanding hair vibrancy, facilitating faster product formulation and stronger claim substantiation. This study clarifies key attributes for ideal hair colour vibrancy, guiding product development to meet consumer expectations.