Can I leave semi-permanent dye in my hair overnight?

  • I don’t recommend leaving semi-permanent dye in your hair overnight. Although semi-permanent dyes are less aggressive than permanent ones, they still have chemicals that must be used following the directions of the manufacturer.
  • Also, no matter how long you leave the semi-permanent dye in your hair, you won’t get any extra benefit. I mean, the color won’t get any lighter or darker or brighter or anything.
  • So, the best thing you can do for your hair is to leave the semi-permanent dye in just as long as the manufacturer recommends.


rose gold

Some days ago I was asked a question that worried me: “What if I leave the semi-permanent dye in my hair all night?” one girl asked me.

My client’s question worried me because, although I’m not against people dyeing their hair at home, I consider it delicate to do weird experiments on their hair. What’s the need?


 What many people don’t fully understand is that some things we do to our hair can’t be undone. 

For example, leaving a semi-permanent dye in longer than necessary wouldn’t ruin your hair. But, what if it was permanent? It could ruin your hair permanently. Why?


I’ll tell you below the differences between one and the other.

Before you start, I invite you to consider the following: what do you want to achieve by leaving dye on your hair all night? Do you want a darker hair color?


No matter how permanent or semi-permanent the dye is, leaving it on overnight will not make it darker. Even if you leave it on for two days, you’ll end up getting the color you paid for at the store.

If you’re looking for a darker hair color, then, go ahead and choose a darker color. It’s that simple. You’ll spend a few extra bucks but I assure you that your hair will be grateful.


If you want a to have hair like straw, then leave the dye on all night and that’s what you shall get.

Am I already late and you’ve ruined your hair?


If so, I’ll give you some good treatments that you can do at home.

So, in short, here you will find all that you need to know:

  • What happens if I leave a semi-permanent dye in my hair all night?
  • What happens if I leave a permanent dye in all night?
  • How can you repair your hair?
  • Home made recipes for repairing damaged hair


I hope this guide helps you avoid those mistakes that will damage your hair forever, pay attention and don’t leave anything out of control.


What happens if I leave a semi-permanent dye in my hair all night?

turquoise blue fuchsia and others

  • Hair professionals recommend that the times specified by each brand are respected. There is a reason why laboratories detail them in their boxes. If they are not taken into account, we can cause an allergic reaction.


  • Fortunately, semi-permanent dyes do not contain elements such as peroxide or other harmful chemicals. They act in such a way that they only deposit the colour on the outer layer of the hair, without modifying its internal molecular structure.
 So, although I recommend that you respect the instructions strictly, if you leave it in longer than you should, it won’t damage your hair. 


However, keep in mind that if you want the dye to last longer, or its color to be super intense and bright, even if you leave it a thousand hours, both color and its durability will be exactly the same. Instead, you would only be risking a possible allergy.


What happens if I leave a permanent dye all night?

  • Here’s where it gets complicated: permanent dye includes chemicals that are aggressive to our hair fiber, such as peroxide, which opens up our hair cuticle for pigment to cling to the middle layer, called Cortex.

Without beating around the bush,  you must understand that if you leave this product any longer, you will only make it dry out completely, damaging its structure. Your hair may even start to fall.  


  • If you plan to leave it longer for color to last longer, let me tell you that you are making a big mistake. The only thing you will achieve is to wash it faster, since the cuticle will be under the effect of peroxide opening it more than it should, and it will become saturated.

Other consequences can be loss of strength and gloss. Is that what you want? I’m sure not, so I think you’ll pay more attention to the instructions from now on.


How can you repair your hair?

due to lack of hydration

If you’re looking up this subject it’s because I’m really late and you’ve already damaged your hair. I want you to know that here you have an ally who can help you heal your hair progressively.

There is no science or magic wand here. I suggest you have patience because this will last long.

It’s not an easy task, but it’s not impossible either.


If you are one of those who avoid cutting their hair as much as possible, cut only the ends. However, I want you to know that restoring it will cost you twice as much work.


  • Home-made recipes for hair repair

These will be the real wizards who will restore your hair, but you have to be consistent and not forget about them if you really want to see results.

On the one hand, we have the home-made solutions. Always read well and inform yourself before applying any product and make sure you are not allergic to any of the components. On the other hand, we have the restorative masks and cream baths.

If you do not want to spend more money and prefer to do these treatments at home, here are the best results.


3 homemade masks to restore hair after coloring


  • Avocado, honey and egg: mix three spoonfuls of honey, one avocado and one yolk. Once the mixture is homogeneous, apply it to your already clean hair, leave it for 30 minutes and rinse.
  • Olive oil and egg: mix the egg yolk with three spoonfuls of olive oil. Once the mixture is homogeneous, apply it and leave it for 20 minutes. Rinse with cold water.
  • Almond oil, one egg and honey: mix the whole egg with three spoonfuls of almond oil and one spoonful of honey. Apply the mixture evenly and leave it for at least half an hour; rinse with plenty of water.


Extra tips:

  • When applying the masks, try to avoid them touching your scalp.
  • When you are ready to apply the mixture, put on a thermal cap, a bath cap or, simply, a bag. This will help the nutrients to penetrate better.
  • When you have to rinse, always rinse with warm, almost cold water. Never use hot water.

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