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Fig 1.
PERMANENT HAIR COLOUR

Health and safety:

Before working on clients always take a skin test.

Skin tests:

Before applying any permanent hair colour you should always take a skin

test.

Human skin can be allergic to many things, and there is no way of knowing
which person is allergic to what. Before you use anything on a clients skin,

be safe and carry out a 48 hour skin test. A skin test will tell you whether or

not your client is allergic to what has been applied to the skin.

The worst type allergies are to Paraphenylenediamine’s also known as Of course it is possible that the skin is allergic to the adhesive from the

(PPD’S.) PPD’S are used in the darker hair dyes only; an allergic reaction to plaster, it is all right to colour the hair if a reaction has occurred to the plaster,
PPD’S causes swelling and splitting of the skin, and if they are allowed to but not the hair dye Please see Fig 2.

enter the blood stream can slow down breathing, and in extreme cases cause

death. Fig 2.

The hair colour companies recommend that a small amount of the hair dye,

about the size of a ten pence piece, not mixed with Hydrogen peroxide is

applied directly to the skin, in an area that is convenient to wear i.e. under
the arm or behind the ear. Cover the hair dye with a plaster and leave for 48

hours. Remove the plaster if an allergic reaction has occurred do not colour.

Please see Fig 1. The skin above is allergic to the adhesive not the

hair dye so it is alright to proceed with the hair colour.

Do not carry out a skin test for a bleach and toner. Bleach under a plaster on
sensitive skin for 48 hours will always give a reaction, due to the fact that the

bleach will just burn the skin. Bleach toners are usually just toners with out a

base shade, and do not contain the PPD’S you usually find in dark colours, so
there is no need for a skin test.