Answer:
a lot of tools
Step-by-step explanation:
with the information given, the answer could be a variety of things, such as a pensile, crayon, pastel, charcoal stick, marker, highlighter- the list goes on
one thing that all of these have in common is that each one (when dragging the tip across the paper or drawing medium) lays down a layer of pigment, basically a layer of the same substance that was used to make the bright and colorful part of the tool, this is why tools like crayons or pencils are soft, so that they can lay the pigment with ease, the harder the substance, the less pigment is applied and therefor a lighter or more transparent look of the laid pigment
i hope this isnt too complicated to understand, if you need help with it ping me up :)