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www.sallybeauty.com/FAQ_HAIR_COLOR_35.html

What is "demi-permanent" hair color? How long does it last? Demi-permanent hair color is “deposit only,” and does not contain ammonia so it will not "lift" of lighten hair. However, demi-permanent color does contain a small amount of peroxide, which allows for a subtle, but noticeable, color enhancement and increased longevity.

www.livestrong.com/article/69199-demi-permanent-vs.-semi-permanent

It contains no ammonia but does have a small amount of peroxide, which opens the hair cuticle slightly so that some color will be absorbed. Demi-permanent does a better job of darkening hair than semi-permanent does, but it doesn't lighten hair. Demi-permanent hair color will fade and typically last 12 to 24 shampoos.

www.esalon.com/support/category/3/learn-about-hair-color/39/permanent-vs-demi...

Demi-Permanent hair color deposits color pigment onto the hair cuticle without penetrating it. This means that demi-permanent color can darken your hair color, but the absence of ammonia makes it unable to lighten the hair. Since it does not make a permanent color change, the color fades gradually, lasting up to 24 washes.

www.reference.com/beauty-fashion/long-demi-permanent-hair-color-last-dd5505f5...

Demi permanent hair color can last up to 6 weeks and typically fades after 20 to 28 hair shampoo washes. As a hair-coloring agent, demi permanent formulas are used to enhance natural hair color, to darken the natural hair shade and to refresh previously colored hair.

www.hairmag.org/hair-color/demi-permanent-hair-color-dye-how-to-use-remove...

Demi-permanent hair color contains no ammonia but still has a small amount of bleach for depositing some amount of color to the hair more effectively than semi-permanent hair color (without lifting/lightening the hair).. How long does demi permanent hair color last? Typically, demi-permanent color can last from 12 to 24 washes, depending on factors like hair texture, porosity, and pervious ...

www.hairfinder.com/hair4/how-long-hair-dyes-last.htm

How Long Hair Dye Lasts Q: How long do hair dyes last? How fast does hair color fade and how often will I need touch ups? A: The duration of the color depends on the type of haircolor. Temporary color only lasts until the next shampoo. Semi-permanent and demi-permanent colors last 8-12 shampoos. Permanent haircolor, however, is just that ...

www.reference.com/beauty-fashion/long-semi-permanent-hair-color-last-c1fbe...

Users of semi-permanent or temporary hair color can expect their color to last for about 6 weeks. Color fades with shampooing and exposure to air. It may be difficult to decide whether to use a semi-permanent or permanent hair color, especially for the first-time user.

www.hairmag.org/hair-color/semi-permanent-hair-color-long-lasts-brands-remove

Hair dyes/hair colors are usually divided into three categories depending on the duration of results and color change they offer: permanent hair dyes, demi-permanent hair dyes, semi-permanent hair dyes, and temporary hair dyes. Semi-permanent hair dyes as their name suggests offer semi-permanent results, which last several washes (usually 4-12 washes).

www.clairolpro.com/inside-clairol-pro/demi-semi-permanent-faqs

Will demi-permanent color cover gray? A demi-permanent will cover gray only if the hair is fine or porous. It will usually blend gray, making it appear highlighted. What is semi-permanent color? A semi-permanent color contains no ammonia and deposits only. It does not require mixing with a developer and lasts anywhere from 4 – 12 shampoos.

www.clairolpro.com/inside-clairol-pro/demi-permanent-hair-color

Because the developer is dedicated and mild, the hair remains in optimal condition. Demi-permanent hair color is the fastest growing color category in the industry because of its versatility. It is excellent for glossing or for refreshing previously tinted hair for added vibrancy and shine, and is essential for color correction.