Specifically, permanent hair dye lasts about 6-8 weeks. This is different from the other types of hair dye. Temporary hair dye doesn't really hold on to hair and can be rinsed away easily, whereas semi-permanent and demi-permanent hair dyes last only about 6-8 washes because the pigment simply coats the hair.
Does permanent hair dye fade? Sadly, yes. While permanent hair dye won't wash out of your hair in the same way that temporary, or semi-permanent hair dye does, it will eventually start to fade and change shade over time.
30%-70% gray coverage depending on the brand, professional product, home product, and the chemicals used to deliver the color. The color itself doesn't last as long as permanent hair color, and fades off within a few weeks.
After many washes, the silvery hues will begin to fade to its original colour, which is a very light blonde. This will always be the case no matter what hair dyes that you have employed, regardless of whether it was permanent or semi-permanent. This occurs because the silver pigmentation tends to be weaker.
Permanent hair dye typically lasts for between four to eight weeks before it grows out or fades (more on that below).
Permanent Color for Full Gray Hair Coverage
If your natural hair color is becoming more salt than pepper, permanent color might be the solution for you. Permanent hair color allows you to get full gray hair coverage, often in one single process service.
Neutral shades like soft blonde, mushroom brown, light copper, and caramel blonde balayage are the easiest to blend gray into (and maintain over time without wanting to shave your hair off).
According to hair biology experts and styling experts alike, grey hair is more resistant to color than younger hair because of its texture. The relative lack of natural oils in the hair compared to younger hair make it a rougher surface that tends to reject the color being applied, especially around the roots.
If you add the right hair colour, your 'grey' hair will act as highlights, giving you a completely new look that will get you noticed for all the right reasons. Professional colourists usually recommend a darker shade for your roots and a lighter shade that matches your natural hair for the rest.
Apply Hair Color With Foils
If you're trying to transition to gray hair, you want to avoid an all-over dye job. Instead, have your colorist apply your hair color with foils — much like applying highlights, except you won't be lightening your hair. This will simply help you transition between the two shades seamlessly.
Ideally, permanent hair colour would stay just as vibrant as it was the day you coloured it, at least until the roots grow. On most heads of hair, that would mean a good 6-8 weeks between touch-ups.
"If you leave your color on for too long, there is potential for extra deposit of pigment to occur. You can't make your hair too light by leaving a tint color on too long (unless you're bleaching), but it can make your hair darker than intended," says Tardo.
Don't assume that grey hair makes you look older
Hair naturally loses pigment as we age, but stylist Paul Falltrick points out that the notion that grey hair makes you look older is increasingly becoming a misnomer: "Grey shades can be stereotyped as ageing, but a clean-looking grey is stunning" he says.
People use “gray,” “white” and “silver” interchangeably to describe hair that is turning or has turned. Its appearance — whether it looks, gray, white or silver — depends on how much natural color, or pigment, remains, experts say.
Gray hair poses some unique challenges. It's coarser than your natural hair, and gray hair follicles make less oil, making it drier as well. This makes it harder for color to penetrate, so you may have to leave it on longer, which can cause more damage.
Herbishh Shampoo for Gray Hair, $39.99
This shampoo will help hide your graying hair and achieve vibrant locks. This is a hair dye shampoo, so it will deposit color right into your hair, helping cover any grays while restoring your original hair color.
All you need to do is apply a demi-permanent colour all over your head. Say for example you're naturally a brunette, go with a golden blonde shade. It will only deposit the blonde colour on the grey hairs, turning them into golden highlights.
As natural brunettes, brown hair dyes can last the longest compared to other hair dyes. There's no need to bleach your hair colour as the eumelanin content will allow the hair colour to stay on longer. Besides, with the aforementioned colouring techniques, you can still flaunt your beautiful brown locks.
A common reason behind fast-fading hair color is insufficient processing time, meaning the hair color did not stay on long enough. This especially holds true if you or your client have grey hair. Grey hair cuticles are tightly packed down and take longer to open and absorb artificial hair color molecules.
One of the most popular and gentle ways to treat gray hair is using henna powder. Henna is a powdered form of leaves which essentially helps to treat the gray hair when used every month. Henna comes with natural color pigmentation, thus, covering the gray roots easily.
As we said before, going blonde makes grey hair that much easier to cover, as blonde hair and white hair are quite close to each other in aspect. If the natural hair is quite dark (level 6 and below) you will need to use bleach first and lift the whole hair.
However, the rate of hair colour loss is largely determined by your genes. The chances are that you will experience premature greying if your parents do. However, certain nutritional deficiencies and underlying medical conditions may play a role. In these cases, yes, white hair can turn black again.