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How Are Hair Colours Labelled? |
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Permanent and semi-permanent hair dyes, which employ coal tar dye bases and coal tar dye intermediates to produce the colour, are required by law to also carry on their labels:- a warning that the product may cause skin irritation on certain individuals;
- a warning not to use the product for dyeing eyebrows and eyelashes because to do so may cause blindness; and
- instructions for carrying out a preliminary test for skin irritation called the patch test.
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