In order to study a fossil, we must be able to see it. But sometimes the fossil is hidden in the matrix - the rock that surrounds it. The impression of the fossil may be very faint, or the fossil may be the same colour as the matrix. Sometimes the fossil is very fragile and must be repaired and strengthened before it can be studied.
Some fossils are so tiny that they can only be studied using a microscope.
Paleontologists have to use a variety of preparation techniques to make the fossils easier to see. Sometimes the fossil's impression is easier to study than the fossil itself. A technician prepares a fossil using an engraving tool to carve away the unwanted rock. Some fossils can be scrubbed with soap and water. Unwanted rock and dirt may be removed carefully from around the fossil using small brushes, dental tools, or an electric or air powered engraving tool.