Final answer:
Coal is used in makeups and dyes because it contains carbon, while graphite and diamonds have properties that make them unsuitable for such use.
Step-by-step explanation:
Coal is used in makeups and dyes because it contains carbon, which is a common ingredient in pigments and coloring agents. It can provide a black or gray color to the product. Graphite and diamonds, on the other hand, are not used in makeups and dyes because they have different properties than coal. Graphite is a soft and flaky material that would not be suitable for use in cosmetics, while diamonds are too valuable to be used in such products.