Excellent product like all the emulsions from System. Let me clarify initially that it is not a simple nourishing emulsion for colored hair. Specifically, its job is that after we finish with the dye and wash our hair, we rinse out the shampoo and apply it along the hair from the roots to the ends as well as we can (it’s like hair mousse, don’t underestimate it, the mousse expands and spreads) and we leave it for about 10 minutes. Its purpose is to lock in the color in dyed hair so that we don’t have the result of washed out and faded color after 2 weeks, especially for copper tones, and generally for the more vibrant colors. At the same time, it actually nourishes the hair and helps it recover from any damage that, let’s face it, even the most friendly dye can cause. After the 10 minutes are up, we rinse it out and proceed with our conditioner and mask (essential steps that should not be skipped). It does what it says. I noticed my hair was softer while usually, the dye leaves it feeling "somehow" for the first week even though I nourish it quite a bit with good products, and the color hardly faded at all nor did I see a lot of copper washing out in the bathtub as always happened, and I ended up... looking like a mess in less than 3 weeks, so I would use a color mask to brighten the color a bit until I went for dyeing. Therefore, excellent product, just like the whole company in general, and I recommend it.