L'Oréal Professionnel Dia Color 5.1 60ml

Why you'll love it

• A demi-permanent gloss colour in 5.1, a light brown with an ash reflect (cool)
• 92% natural-origin formula, with no ammonia or silicone
• Around 6 weeks of glossy, true-to-tone colour
• Up to 70% grey coverage and 100% true-to-tone natural reflects
• Gives hair up to 3x more shine* for a luminous finish

Glossy, cool, true-to-tone colour. L'Oréal Professionnel Dia Color in 5.1 is a demi-permanent gloss colour that delivers rich, true-to-tone colour and serious shine, in a light brown with an ash reflect. It's a 92% natural-origin formula with no ammonia or silicone, giving around 6 weeks of glossy colour with up to 70% grey coverage. As a demi-permanent, it deposits tone and blends grey without the harshness of a permanent, making it a lovely choice for refreshing, toning and adding gloss.

What it does for your hair

Shade 5.1 sits at depth 5 (a light brown) with an ash reflect (a cool tone), so this is a properly cool, anti-warmth shade that helps counter yellow and brassiness. Because it's demi-permanent, it deposits colour rather than lifting, so it refreshes, tones and glosses, blends up to 70% grey, and adds a glossy, luminous, true-to-tone finish (with up to 3x more shine*), then fades softly over around 6 weeks. Being ammonia- and silicone-free, and 92% natural origin, it's a gentle way to add tone and shine.

How to use it

For professional use. Carry out an allergy alert test at least 48 hours before every application (see below). Mix Dia Color with the appropriate developer at the correct ratio for demi-permanent application, following the L'Oréal Professionnel instructions. Apply to the hair, process for the recommended time, then rinse thoroughly and follow with a colour-safe conditioner. As a cool, ash-based shade, keep it looking fresh with colour-safe care and, where needed, gentle purple/silver toning to hold the cool tone, and avoid warm-refresh products that would fight the coolness.

Who it's for

This one's for anyone wanting a light brown with an ash reflect, whether that's refreshing, toning, glossing or blending grey. We've been perfecting colour, blow-dries and styling for clients in Codsall for years, and a demi-permanent gloss is one of the gentlest, most flattering ways to refresh and enhance colour.

Build your routine

Cool, ash-based shades stay fresh with colour-safe care and, where needed, gentle purple/silver toning to hold the cool tone, and avoid warm-refresh products. Find a suitable wash in our shampoo collection, explore more colour-care options across our hair products, or browse our shop by brand pages for your favourites.

Free UK delivery on all orders.

*Up to 3x more shine, based on the brand's testing. This product is used with a developer and contains ingredients that can cause an allergic reaction. Always carry out an allergy alert test according to the instructions at least 48 hours before each use, even if you have coloured your hair before. Not intended for use on under-16s. Wear suitable gloves, avoid contact with the eyes, and do not use on an irritated or damaged scalp.