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Hi, I'm Maria Granger.

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Today, we're going to look at pre-service testing,
and we're going to start with incompatibility testing.

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For this I've taken a strand cutting of the client's hair.

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I sellotape it's a little bit of foil
so that it's more secure.

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We're going to mix ammonium

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and 6% hydrogen peroxide.

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For this test what we're checking for is metallic salts.

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Once you've mixed one part

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of the ammonium to 20 parts of the hydrogen peroxide,

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you need to place your test cutting into the solution.

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So make sure

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that the hair.

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Is covered

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and what we are looking for are any reactions.

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So if you notice any bubbling, fizzing,

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if the hair discolours or the bowl feels hot,

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there is an incompatibility within the client's hair.

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If that is the case, this will mean
that you will not be able to carry on with the service,

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you may need to look at alternative services for the client.

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The next test that we are going to carry out

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is a test cutting, or sometimes known as a color test.

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For this, we're going to take a strand of the client's hair,

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attach it to a foil.

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And what we are going to do is color the client's hair

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for the target color that you've chosen through consultation.

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Once you've mixed your color,

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according to your manufacturer's instructions, place
the color

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on your test cutting.

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And make sure that you saturate the hair thoroughly.

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I then fold

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the foil into a packet which will help retain the heat

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and then process

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this strand of hair according to your manufacturer's instructions.

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Once the time is complete, you can rinse off

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the strand test
and then that will give you the target results.

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So you will be able to determine if it's a chosen shade

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that you wanted, the development time
and also the condition of the hair.