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

blue dye in red hair

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  • If you used red permanent hair dye, you can put blue semi-permanent hair dye for different intensities of purple. I’ll tell you which blue dyes you can choose.
  • Alternatively, if you put a red semi-permanent dye before, you can now mix red and blue dye. The darker the blue dye you use, the deeper the purple you’ll get.
  • What I don’t recommend is applying a blue permanent dye to red-colored hair with semi-permanent dye. If you do it, the results could be unpredictable.

 

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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.

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

  • The type of red dye you previously applied to your hair.
  • The blue dye you want to use on your red hair to turn it purple.
 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!

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

renewing the color

 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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  •   If you want deep or dark purple,  choose a dark blue dye, such as BLUE JEAN BABY by ARCTIC FOX or AFTER MIDNIGHT by MANIC PANIC.
  •  To get a more neutral purple,  you can apply LAGOON BLUE from PUNKY COLOUR or BLUE MOON from MANIC PANIC.
  •  Finally, to go for a more intense or lighter purple,  you can choose ATLANTIC BLUE from PUNKY COLOUR or BAD BOY from MANIC PANIC.
 

 

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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.

  • Gather your hair and separate a strand at the back.
  • Apply the semi-permanent blue dye of your choice to that strand.
  • Leave the dye on according to the manufacturer’s instructions.
  • Rinse your strand.

Once the strand dries, check the resulting color.

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  •  If you like the purple you got,  apply the blue dye to your entire mane.
  •  On the other hand, if you don’t like the resulting purple,  you can repeat the test on another hair strand with a lighter or darker blue dye.

 

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

blue dye on red hair result

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.

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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?

 

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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.

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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:

  • Apply a semi-permanent hair color.
  • Perform a strand test.

 

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.

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

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