Dia Light and Dia Richesse are both ammonia-free demi-permanent colours from L'Oreal Professionnel's Dia family. The key difference: Dia Light is an acidic gloss that gives translucent tone and high shine, while Dia Richesse gives a richer, more opaque deposit and slightly stronger grey blending.
Dia Light vs Dia Richesse at a glance
| Dia Light | Dia Richesse | |
|---|---|---|
| Type | Acidic gloss demi-permanent | Demi-permanent (richer deposit) |
| Ammonia | Ammonia-free | Ammonia-free |
| Finish | Translucent, glossy, luminous | Fuller, more opaque, natural |
| Grey blending | Up to ~50% | Up to ~70% |
| Best for | Toning & glossing pre-lightened hair | Natural-looking refresh & grey blend |
| Lift | None | None |
When should you use Dia Light?
Dia Light is the colourist's choice for toning and glossing. Because it is acidic, it closes the cuticle for a high-shine, translucent finish – perfect for refreshing lengths, toning after lightening, and quick gloss services. Learn more in What is L'Oreal Dia Light? and check shades on the Dia Light colour chart.
When should you use Dia Richesse?
Dia Richesse deposits a richer, more opaque tone and blends a little more grey, making it ideal where you want a fuller, natural-looking result rather than a sheer gloss. It is still ammonia-free, so the fade stays soft.
Please note: Dia Richesse availability has changed in the UK and stock can be limited. For the current ammonia-free demi options we stock, see our Dia Richesse availability update – in most cases L'Oreal Dia Color or Dia Light is the recommended replacement.
How to mix both
Both are mixed with L'Oreal Dia Activateur (6 or 9 vol). Dia Light is typically mixed 1:1.5; always follow the current L'Oreal instructions and patch test. Browse all peroxides & developers at trade prices.
Related guides
- What Is L'Oreal Dia Light?
- What You Need to Know About Dia Richesse
- Dia Richesse: What's Changing and What to Use Instead
- L'Oreal Dia Light Colour Chart
Shop the range at trade prices
- L'Oreal Dia Light 60ml
- L'Oreal Dia Color 60ml
- L'Oreal Dia Activateur 1L
- Browse all L'Oreal colour and semi-permanent colour
Hairco & Beauty is a trade-only wholesaler supplying salons and qualified professionals across the UK, with fast delivery and trade pricing.
Frequently asked questions
Is Dia Light or Dia Richesse better for grey?
Dia Richesse blends slightly more grey (up to ~70%) with a more opaque finish, while Dia Light (up to ~50%) gives a more translucent, glossy blend. For full coverage, use a permanent colour.
Are Dia Light and Dia Richesse both ammonia-free?
Yes. Both are ammonia-free demi-permanents that fade softly with no harsh regrowth line.
What can I use instead of Dia Richesse?
Dia Richesse stock can be limited in the UK. L'Oreal Dia Color or Dia Light are the closest ammonia-free demi alternatives we stock.
Written by Charlotte Read, Content Writer at Hairco & Beauty. Charlotte has over six years' experience in professional hair and beauty, and our guides are informed by colleagues with 100+ years of combined salon experience and by insight from the trade customers we supply. More about our content.
