L’Oreal Hair Color Guide: INOA Myths, Plus Majirel vs. Dia Light Explained

L’Oréal Professionnel remains one of the most trusted names in salon hair color, but with frequent line updates and multiple sub-brands, formulation confusion is common.

Is INOA being discontinued? When should you reach for Majirel instead of Dia Light?

This guide sets the record straight on L’Oréal’s current product lineup, breaking down the exact differences between their flagship permanent and demi-permanent lines.

1. The Truth About L’Oréal INOA: Discontinued or Reformulated?

If you’ve heard rumors that L’Oréal INOA was discontinued, here is what actually happened:

• The Reality: INOA was not phased out; it underwent a massive modernization and reformulation.

• What Changed: L’Oréal updated INOA into a 100% vegan, oil-based (ODS - Oil Delivery System) formula with cleaner ingredients, new tube packaging, and improved fluid mixing consistency.

• The Result: Some older shade numbers and original packaging were phased out (leading many to believe the line was gone), but the new INOA offers the same zero-ammonia, 100% gray coverage with enhanced scalp comfort.

Shop INOA: Stock up on reformulated tubes in our L'OREAL INOA COLLECTION.

2. Majirel vs. Dia Light: What’s the Difference?

Choosing between Majirel and Dia Light comes down to chemistry and target results: permanent lift/coverage versus gentle surface toning.

Feature	L’Oréal Majirel	L’Oréal Dia Light
Category	Permanent Hair Color	Acidic Demi-Permanent Gloss
Ammonia Level	Contains Ammonia	100% Ammonia-Free
Gray Coverage	100% Opaque Coverage	No Gray Coverage (Tones/Blends only)
Lift Capabilities	Lifts up to 3 Levels	Zero Lift (Deposit Only)
Best Used For	Root touch-ups, grey coverage, rich permanent base color.	Toning highlights/balayage, refreshing ends, adding glass-like shine.

3. How to Formulate & Apply

L’Oréal Majirel (Permanent Base & Gray Coverage)

• Mixing Ratio: 1 : 1.5 (e.g., 50g Majirel color + 75g developer).

• Developer Choice:

  • 20 Vol (6%): Standard 2 levels of lift and 100% gray coverage.

  • 30 Vol (9%): 3 levels of lift.

• Processing Time: 35 minutes at room temperature.

Buy direct: Get genuine L'OREAL MAJIREL COLOR and L'OREAL DEVELOPERS.

L’Oréal Dia Light (Acidic Toner & Gloss)

• Mixing Ratio: 1 : 1.5 (e.g., 50g Dia Light + 75g Dia Activator).

• Developer Choice: Mix exclusively with L’Oréal DIA Activator (6 Vol or 9 Vol).

• Key Benefit: Because it uses an acidic pH formula, Dia Light closes the hair cuticle post-lightening, sealing in moisture and eliminating brassiness without shifting the natural base.

• Processing Time: 5 to 20 minutes depending on desired tone intensity.

Buy direct: Browse our  DIA LIGHT COLLECTION  to find shade favorites like 10.12 and 9.11!

Summary Checklist for Stylists & Buyers

• INOA: Ammonia-free oil-based permanent color (reformulated, not dead!).

• Majirel: Go-to permanent color for 100% gray coverage and root work.

• Dia Light: Go-to acidic toner for balayage, highlights, and glossing.

• Shop the entire collection at wholesale pricing on our FULL L'OREAL COLLECTION page!