I have thin and dry hair ,how can i turn them into a black and shiny ones?

Usually when I dye my hair a darker color it will make it softer and shinier. Just make sure to pick a dye with no ammonia and plenty of conditioners. Use a deep conditioner ( I like Garnier Fructise 3-min deep conditioner). You can also buy spray-shine enhancing products to make it shinier, just make sure not to put too much or your hair will look greasy,.