both are correct. one of them is yours.
Nobody has to earn the right to cover their gray
There is a lot of talk at the moment about “embracing” gray, and an implication underneath it that covering gray is somehow unenlightened. That is a fashion, not a fact, and it is being sold to women who did not ask for a moral position on their own hair.
Full coverage is a legitimate, sophisticated choice. So is blending. So is growing it out completely. The correct answer is the one that matches what you want to see in the mirror and how often you want to be in a chair.
Full gray coverage
An opaque, permanent or demi-permanent formula deposits pigment across the whole strand for a uniform result. It gives the most consistent, finished look and the most predictable result photograph to photograph. It also produces a clear line of regrowth, so it wants a visit roughly every four to six weeks depending on how fast your hair grows and how strong the contrast is.
Dimension is still possible — a flat single-process is not the only option. Adding a few lighter pieces through the top keeps coverage from reading as a helmet.
Gray blending
Highlights, lowlights, root shadowing and gloss used together so the gray reads as brightness rather than as gray. Regrowth is softer, so appointments stretch to eight, ten or twelve weeks. The trade is that on a bright day, in the right light, some gray remains visible — which for many women is entirely fine, and for some is not. The three levels of blending, explained →
Resistant gray
Some gray simply will not take color easily. It is often coarser, with a tighter cuticle, and it sits most stubbornly at the temples and the front hairline — exactly where it shows most. This is not a failure of the color, and it is not something you did wrong.
It is handled technically: a pre-softening step to open the cuticle, an adjusted formula with more natural base tone, and the full development time rather than a rushed one. If your gray has ever “faded within two weeks” or gone slightly pink or transparent at the front, resistance is usually the reason. There is a full explanation in why gray hair will not take color.
Ammonia-free on gray
Yes, professional ammonia-free color covers gray, including resistant gray, when it is formulated correctly and given its full processing time. What ammonia-free means here is professional European color made with up to 99% organic and natural ingredients depending on the formula. It does not mean chemical-free, non-toxic or damage-free, and any salon telling you otherwise is selling you something.
Occasionally the right technical answer for a very resistant head of gray is a formula containing a small amount of ammonia. We will tell you when that is the case rather than delivering a weaker result to protect a marketing claim.