L'Oréal Professionnel Dia Light 9.18 hair colour 50 ml

Name: L'Oréal Professionnel Dia Light 9.18 hair colour 50 ml
Brand: L'OREAL PROFESSIONNEL
SKU: 3474637156602
Availability: InStock

Reference 3474637156602

In stock: 1-4

Pro only

Acidic demi-permanent hair colour for professional toning, adding shine and refreshing the existing shade, especially after lightening. Its acidic colouring technology is suitable for salon toning and gloss services.

L'Oréal Professionnel Dia Light 9.18 colour 50 ml is an acidic pH demi-permanent ammonia-free colour/gloss for toning, refreshing colour and adding shine, especially suitable for previously bleached, sensitised or colour-treated hair.

Key benefits

Product type: hair colour.
Shade / variant: 9.18.
Acidic pH technology helps rebalance the hair's pH after bleaching and smooth the cuticle.
The latest formula is enriched with hyaluronic acid for more intensive hydration.
Designed to neutralise unwanted undertones, refresh faded lengths and increase shine.
Creamy, milky texture allows precise control of application.
Pack size: 50 ml.
Acidic demi-permanent, ammonia-free colour for toning, refreshing colour and adding shine, particularly suitable for sensitised or previously lightened hair.
The hyaluronic acid formula provides up to 2× more immediate hydration and up to 82% more shine; the colour effect can last up to 6 weeks.
The acidic pH helps seal the cuticle and preserve cortex integrity; on bleached hair, the manufacturer reports up to 3× less breakage in instrumental tests.

Active ingredients and technology

Hyaluronic acid acts as a moisture-binding ingredient, while the acidic colouring system deposits pigment without subjecting the hair to the strong alkalisation typical of permanent colour.

Hair colour: function and professional use

Acidic pH demi-permanent colour/gloss without ammonia for toning, refreshing colour and adding shine, especially suitable for previously bleached, sensitised or colour-treated hair.

How to use the product?

Basic use: Mix Dia Light cream with Dia Activateur 6, 9 or 15 vol. at a 1:1.5 ratio. Apply to dry hair with a brush or applicator bottle; processing time is 2–20 minutes depending on the service and desired pigment deposit. Then gently emulsify and rinse thoroughly.

For this product: For shade 9.18, apply to areas where shine restoration, toning or colour refreshing is needed; on more porous lengths, monitor the result visually and do not exceed 20 minutes. After rinsing, use a shampoo suitable for colour-treated hair.

Technical information

Brand: L'Oréal Professionnel
Range: Dia Light
Product type: hair colour
Shade / variant: 9.18
Volume / weight: 50 ml
EAN / GTIN: 3474637156602
model: 3474637156602

Who is this product suitable for?

For toning after bleaching, refreshing colour on the lengths, adding shine and gentle demi-permanent colouring.

Frequently asked questions

What is this product intended for?

For toning after bleaching, refreshing colour on the lengths, adding shine and gentle demi-permanent colouring.

Can the product be used at home?

This is a professional colouring product. The mixing ratio, developer selection, assessment of the starting base and processing time significantly affect the result, so it is intended for use by a professional colourist.

Volume: 0-50ml
Properties: For shine
Toning hair colors
Usage: For professionals
Hair color shades: Ash
Browns/Beiges
Collections: DIA LIGHT

About L’Oréal Professionnel

L’Oréal Professionnel Paris is a professional hair brand whose origins date to Paris in 1909. Its history is linked to chemist Eugène Schueller, who developed hair colour and built the business around the needs of professional hairdressers. That relationship with salon professionals remains central to the brand today.

The portfolio spans professional haircare, colouring and styling products for salons, hairdressers and customers who want to maintain professional hair results at home.

What is L’Oréal Professionnel known for?

Science, technical expertise and innovation have played a central role throughout the brand’s history. Its professional innovations range from early developments in hair colour to contemporary systems such as iNOA and Metal Detox, alongside advanced care and styling ranges.

Metal Detox uses Glicoamine technology developed to neutralise metal particles inside the hair fibre and reduce the unwanted effects associated with metals during colour, balayage and lightening services. Other ranges address needs including damaged or chemically treated hair, colour maintenance, blonde hair, curls and scalp care.

L’Oréal Professionnel products

The range includes professional shampoos, conditioners, masks, serums, oils and leave-in care. The current SalonLine assortment can be explored on the L’Oréal Professionnel brand page.

Serie Expert haircare

Serie Expert brings together targeted routines for different hair needs. Metal Detox focuses on the effects of metal particles in hair, while other ranges provide specialised routines for damaged, coloured, blonde, curly or scalp-focused haircare.

Professional colour and styling

The professional colour portfolio includes permanent and tone-on-tone colour systems, lightening products and related salon products. SalonLine also offers a dedicated category for permanent hair colours. For hold, texture, shape, volume and finish, customers can also explore professional hair styling products.

Who are L’Oréal Professionnel products for?

The range is relevant to professional hairstylists and salons as well as customers looking for targeted, salon-led haircare at home. Depending on the individual range, routines can be selected for damaged, coloured, bleached, curly or unruly hair, scalp needs, professional colour services and styling.