L'Oreal Dia Light
L’Oreal Professionnel DIA Light is your go-to acidic demi-permanent gel-crème haircolor without ammonia, specially designed to gloss, tone, and refresh colored or sensitized hair. With its gentle acid technology, this haircolor smooths the cuticle, delivering a mesmerizing vinyl shine and intense care for your precious locks. Say goodbye to lift concerns, as DIA Light offers zero lift, making it the ideal choice for your hair-enhancing needs.

Discover the L'Oreal DIA Light Color Chart - your key to a world of mesmerizing haircolor possibilities! Explore a stunning array of shades, from cool to warm, designed to gloss, tone, and refresh your hair with an unmatched vinyl shine. With its gentle acidic formula and zero lift, Dia Light delivers intense care and gorgeous results, making it the ultimate choice for professionals seeking to enhance their clients' haircolor experience. Unleash your creativity and find the perfect hue to elevate your style to new heights with L'Oreal DiaLight Color Chart.
















Let customers speak for us
from 884 reviews
The Igora Oil 9/30 developer was excellent. It was creamy, no offensive smell and the end result was better textured hair, great coverage and easy wash out. Highly recommended for coloring predominately white hair.

This is the best product I've ever used for my hair. Such shine and finish for my style. The delivery was faster than expected.

Been using this colour code for years! I love it and will never change! Highly recommended if you want intense Red!

This is now used as a part of regular K beauty ritual before bed. My co-star in a show we were working on introduced it to me. Have been using it ever since.

This is what I needed for my blonde hair! Very fast delivery.

I was introduced to Root Canal during a hair cut at a salon. All of a sudden, my very fine hair had volume and some poof. Root canal is sprayed on your roots after washing your hair . Then fluff and a normally flat fine cut turns stylish. I've been buying it now for years.

I have been very satisfied with my products! I have referred others to you now. Packaged great prompt delivery! So glad I found you! Thank Hou!

This toner color is radiant and suits my skin tone!

This original formula is difficult to find in the states so I'm thrilled that Cosmetic World had it in stock. Sure, there are many molding products but this is perfect for me!

I love this product, beautiful shade selection and easy on the hair, I recently used in place of a toner and worked out better than I could have expected, thanks so much! will be ordering more soon

I have used this for years and find it easy on the hair. Shipping and service was fast and excellent. Thank you

Love it! Leaves hair smooth.

I love this conditioner and the shampoo actually. Ordered online, received promptly. Will order again.

I love this mousse! It holds so well but feels very light and natural. So glad I found it!

Cosmeticworld had the product I was looking for at the best price I’ve ever seen. They were also very quick to respond to my request. Shipping was also very quick. I will definitely order from cosmeticworld again.
What Makes L’Oreal Professionnel DIA Light Stand Out?
- Glossy Transformation: Tone, gloss, and refresh previously colored or sensitized hair, giving your tresses a vibrant and rejuvenated appearance.
- Vinyl Shine: Embrace the brilliance of vinyl shine as the gentle acid technology works its magic, leaving the hair irresistibly lustrous.
- Intense Hair Care: Experience the nurturing touch of DIA Light, providing hair with the love and care it deserves.
- Versatile Options: Tailored for various hair shades, DIA Light is perfect for corrective color/pre-coloration, colormatch/refresh permanent haircolor, highlighting and Balayage refresh/tone, and lowlights.
Discover the Richness of L'Oréal DIA Light Color Chart
Discover the L'Oreal Dia Light Color Chart - your gateway to a world of mesmerizing hair transformations! This vibrant and captivating chart showcases a spectrum of stunning shades, each powered by L'Oreal's innovative Dia Light formula. From glossy blondes to rich brunettes and striking reds, find your perfect match and embrace the brilliance of vinyl shine. Elevate your hair color game and explore endless possibilities with L'Oreal Dia Light - where vibrant hues meet intense care for your locks.
Milkshake Shades: A Must-Have Delight! Featuring cool shades in Level 9 and 10, our Milkshake Shades are your secret weapon to tone and gloss blondes in a quick 2-10 minutes, delivering stunning results every time.
L’Oreal Professionnel Diactivateur Developer Pro Tips
Achieve the best results by pairing DIA Light with the recommended DIActivateur Developers:
- For blondes: Opt for the 6-vol. DIActivateur Developer.
- For brunettes: Choose the 9-vol. DIActivateur Developer.
- For redheads & fashion shades: Embrace the 15-vol DIActivateur Developer.
How to Use L’Oreal Professionnel DIA Light
Mixing ratio: Combine 50 ml (1 tube) of L’Oreal Dialight color with 75 ml of Diactivateur (1.8% / 2.7% / 4.5%) to create a homogeneous mixture. Apply the mixture to dry, unwashed hair and allow it to process for 20 minutes (service time may vary based on professional hairdresser's recommendation). Afterward, massage and rinse thoroughly with water, followed by shampoo for colored hair.
Important Note: DIA Light is intended for professional use only, exclusively for licensed professionals. Safety is our priority, so we advise conducting a sensitivity and allergic patch test 48 hours prior to each application. Avoid using these products on eyelashes or eyebrows, and always handle chemical products with care.
Elevate your haircolor game with L'Oreal Professionnel DIA Light and unlock the beauty of glossy, refreshed hair, courtesy of our breakthrough acidic demi-permanent gel-crème formula. Experience the magic in every strand!
FREE SHIPPING
Free shipping for CAN orders over CAD 49*IN STORE / ONLINE
Pick up in store or get your package delivered to your doorUS Shipping
FREE Shipping for orders over CAD 99*Established since 1976.
One stop shopping for all your professional beauty products.