How to colour greys at home

From application technique to patch tests, this is everything you need to know about using your Josh Wood Colour Permanent Kit at home.

Our at-home hair dyes don’t contain ammonia…

Ammonia, a chemical that alters the pH levels in your hair and helps colour to penetrate, also causes the dry or undernourished feeling you may associate with traditional colourants. It's the reason you won't find it Josh Wood Colour Permanent Kits. 

By removing this chemical, it allows us to make our at-home hair dyes extremely nourishing, whilst also delivering salon quality colour results. However, due to this slight change in ingredients, Josh Wood Permanent Colour Kits require a slightly different application technique than you may be used to. This is because without an alkaline agent (such as ammonia), it’s a little bit harder for the colour to ‘stick’ to your natural hair.

…But this does mean our dye needs to be applied slightly differently than you may be used to

Josh Wood Permanent Colour needs to be ‘packed on’ to the roots tightly for the colour to take. Practically, this means patting the colour onto your grey regrowth extensively before colouring the rest of your hair, being careful not to brush the colour off of your greys whilst smoothing remaining colour over the rest of the hair. You should make sure you have additional colour left over to apply to your lengths after you have finished covering your roots. Remember, when applying colour, it is a case of more is more!

Generally, if the hair has a significant amount of regrowth to cover, it may be that it requires two boxes the first time around, but this definitely shouldn't be the case every time. Regarding timings: always cover your grey regrowth first and leave this to take hold for 20 minutes, before also covering the remainder of your hair lengths and leaving this for a further 10 minutes.

When care is taken during the application process, there should be absolutely no difference to colour coverage or permanence than that of traditional hair colourants; resulting in exactly the same colour result.

Why you should always do a patch test beforehand:

  • Even if you’ve used at home hair dye before and had no reaction, each formula is different, and you could react to any of the ingredients. Additionally, your skin has the ability to develop an allergy over time, even if you’ve been fine in the past.
  • An allergic reaction can consist of itchy skin or even blisters on your scalp, so it’s really important to do a patch test to avoid these.

How to do a patch test:

Patch Test

  • Mix a coin-sized amount of the colour activator and the colour together in a bowl.
  • Use a cotton bud to apply a small amount behind your ear.
  • Leave it on for 48 hours, you shouldn’t even notice it’s there. Try not to wash it off within this time frame.
  • Tip: It’s very important to fasten the caps on the bottles tightly after you have opened them for the patch test. If you do not, the products may oxidise, and the active ingredients will not work.
  • If you have any signs of reaction to the patch test, wash it off immediately and do not use the colour.
  • If you show no signs of reaction to the dye, go ahead and use the colour as instructed.

Patch Test

Patch Test

Patch Test

Patch Test


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