Evaluation of Hair Colourant

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Chapter: Textbook of Cosmetic Formulation : Hair Dyes

The following tests are carried out to evaluate hair colourants.


EVALUATION OF HAIR COLOURANT

 

The following tests are carried out to evaluate hair colourants.

 

 

1.           The sensitization test

 

2.           The toxic effect test

 

 

1.           The Sensitization Test:

 

The test is carried out on animal skin. The colourants applied on the skin and is kept under observation for 24 hrs. If no reaction occurs, then the colourant is said to be non-sensitizing or non-irritant. Histopathological study is carried out as per requirements.

 

 

2.           The Toxic Effect Test:

 

Toxic effects are studied in animals to know about the long term effects of the preparations.

 

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