ANSWER: The layer which prevents the hair from making it wet. Some chemical dye form a layer on the hair and you can peal it and feel how heavy it makes the hair. 

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ANSWER: If this is a Hindu custom, you must not do that. If not, this is permissible providing it is covered from the eyes of non mahram.

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ANSWER: If you are sure there is a layer that prevents water from reaching the skin and that it is not only a color, in this case you must perform wudhu and also tayammum for the part which wudhu Water didn’t reach.  

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ANSWER: No problem in either of them, providing, the haircut doesn’t resemble that of men or that which is exclusively done by kafir women and you can apply any color that does not form a layer and which is medically safe for you, except black color and any weird colors like green, purple, blue etc.

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