L’Oréal Professionnel Dia Light Hyaluronic Acidic Gloss Color Demi-Permanent Hair Dye 10.21 Lightest Iridescent Ash Blonde 60ml provides instant hydration to hair, combating dryness as a primary sign of damage.
L’Oréal Professionnel Dia Light Hyaluronic Acidic Gloss Color Demi-Permanent Hair Dye 10.21 Lightest Iridescent Ash Blonde 60ml introduces a revolutionary 3-in-1 professional tool designed for gloss, patina, and refresh services. This semi-permanent acid coloring is infused with hyaluronic acid, providing immediate hydration and helping to combat dryness, a primary sign of hair damage. With a unique acid pH technology exclusively for professionals, it allows for infinite color customization with a selection of 76 shades combined with 3 Dia Activators.
Key features include:
- 3-in-1 functionality for gloss, patina, and refresh services;
- Enriched with hyaluronic acid for instant hydration;
- Neutralizes after lightening to revive dull hair color;
- Adds shine with results showing +82% more shine compared to unwashed hair***;
- Significantly hydrates hair with 2x more hydration*;
- Reduces breakage by 3x**;
- New creamy texture preferred by 90% of hairdressing professionals³;
- Available in a palette of 76 shades for customized results.

























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