What Did Cavemen Use to Make Paint? Most prehistoric paints were made from minerals like hematite, iron and limonite that oxidize and combine to form a pigment called ochre. Charcoal, burned bones and ground calcite were also used.
The specific gravity of all other materials are compared to water as a fraction heavier or fraction lighter density, no matter how small or large the fraction is. For example, ammonium nitrate has a specific gravity (sg) of while dry ammonium sulphate has a sg of (1130 kilograms/cubic meter).