Cosmetics Formulation Development

If you want to make a shampoo to cover white hair Can you mix according to this recipe? Do I have to add water or have any ingredients added?

Semi-Permanent Hair Color Shampoo Base 90%

Semi-Permanent Hair Colorant (any color) 10%

and if mixed as follows Please ask for advice on how to use the product for good results.

hello

Shampoo to cover white hair with white hair that has not been bleached. will not be able to use semi-permanent in dyeing gray hair

gray hair dyeing To use semi-permanent must be tinted first or use permanent instead