How long does it take for demi-permanent hair color to fade completely? Anywhere from 12-25 washes. How long it lasts depends on several factors, including the color line, shampoo, conditioner, and styling products you use, as well as how often you swim, spend time in the sun, or use heat styling tools.
Another big factor is the extent of your color change and the current condition of your hair. For example, if you have highlighted, porous, or dry hair and choose a dark brown color, it might last longer because your hair absorbs the color more easily.
Demi-Permanent vs. Permanent Hair Color
You now know what demi-permanent hair color is and how long it lasts. Now, let’s talk about the main differences between demi-permanent and permanent hair color. It’s not just about how long the color lasts – there are other important factors to consider when choosing between these two types of hair color.
Longevity
As mentioned earlier, demi-permanent hair color gradually fades. Because it doesn’t permanently change your hair, you’ll see a less noticeable regrowth line when your roots come in. This means that as your roots grow, the color on the rest of your hair fades, making the difference between the natural and color-treated hair less obvious. How often you need to color will depend on whether you want to maintain your color or let it fade naturally, and how often you shampoo.
On the other hand, permanent hair color is, well, permanent. It might fade a little bit, though a good hair care routine and color reviving glosses will help prevent that. Your color will not disappear completely, no matter the number of washes. Therefore, if you want to go lighter or get rid of the color altogether, you will either need to let it grow out or lighten it using a bleach lightener or color remover.
Impact on Hair
The key difference between demi-permanent and permanent hair color is that demi-permanent color cannot lighten your hair. It doesn’t fully penetrate the hair strand or reach the cortex, so it isn’t as strong as permanent hair color. This means you won’t be able to create as dramatic a change or make your hair lighter than its natural shade. If you want a more noticeable transformation or lighter result, you’ll need to use permanent color.
Gray Coverage
Since demi-permanent hair color does not have as much change or impact on the natural hair as permanent color, it cannot fully cover gray. It will tint, camouflage, and blend the gray, but won’t cover it 100%. The color on the grays may look lighter than the rest of the hair and will almost give a highlighted effect. If you have fewer grays or are not concerned about full gray coverage, then demi is for you. If you have a high percentage of gray or want the grays fully covered, you’ll need to use permanent color.