If I put blue dye over red hair, will it turn purple?

 

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 If your hair is red and you want to transform it into purple by applying a blue dye,  you’re bound to a great result.

You’ll be able to pull it off with no problem. Of course, that doesn’t mean you can do it in five minutes.

 

Before applying the blue dye to your red hair, you need to take into account two issues:

 Also, to be on the safe side regarding the resulting color,   as a colorist, I always recommend you do the strand test beforehand.

Why is the strand test important before coloring your hair?

 

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It’s simple. Before applying the blue dye to all of your red hair, choose a back section of your mane and apply a small amount of the dye.

After the exposure, rinse out the blue dye and check the results. This will confirm how the blue dye works on your red hair.

 

Are you ready to dye your red hair with a blue dye for a unique, style-defining purple?

Let’s get to work!

 

You can put blue semi-permanent hair dye on your red hair that was previously dyed with permanent hair dye

 The blue semi-permanent dye will cover the red and turn your hair purple. 

The question is, what intensity of purple are you looking for?

 

Don’t worry, I’ll tell you exactly which blue dye to choose to achieve dark or light purple hair.

 

 

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And here I come back to the  strand test. 

Unbelievably, I often use it in the salon as well. For example, when I need to check the resistance of a client’s hair before bleaching.

 

What you need to do is very simple.

Once the strand dries, check the resulting color.

 

Applying blue semi-permanent hair dye on hair colored with red semi-permanent hair dye

In this case, you can skip the strand test. And what’s more,  if you have leftover semi-permanent red hair dye, you can use it to get a customized purple color. 

 

And you’ll be able to achieve it before applying the dye to your hair.

 

In short, it’s all about experimenting with colors before dyeing your red hair with blue dye. This option represents one of the advantages of semi-permanent hair dyes.

They allow the mixing of different hair dye colors to customize a unique color. However, don’t forget that I’m only talking about mixing blue and red semi-permanent dyes. Otherwise, if you mix permanent dyes the results can be unknown.

 

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Why should you only mix two semi-permanent dyes?

 

Semi permanent hair dyes aren’t applied with a developer. Simply when you open the dye box,  you see exactly what color will be left in your hair. 

 

You can start mixing the red and blue dye in a plastic tray. Remember which blue dye you mixed.

Also, consider that  the darker the blue, the deeper the purple. Alternatively, the lighter the blue, the more intense the purple you’ll get. 

 

If you don’t have leftover semi-permanent red dye, you can do the strand test with any of the blue dyes I recommended above.

 

Now, you should be especially careful if you want to dye your red hair with blue dye in one case.

Can you imagine what it is?

That’s right.

 I don’t advise you to apply blue permanent dye on your red hair dyed with semi-permanent dye. 

 

As the permanent dye contains chemicals, it’ll remove the semi-permanent dye and the results can actually be uncertain.

Therefore, you have two options:

 

Conclusions

You can use a blue dye on red hair to turn your hair purple. However, my advice as a professional is to always do the strand test.

This way, you’ll accurately know the intensity of purple you’ll get.