Usually with some degreaser for grease pencil. For regular pencil try an eraser.
Colored Wax
Pencil lead is a mixture of graphite (or other colored pigment) and a binder (e.g. clay, wax, plastic, grease).
Sandpaper.
lead pencil
No, he preferred Crayola markers (especially the purple).
It allows you to mark on glass to label something during a lab and then later wash off the grease.
carbon fibre
Crayons, pencils, markers?
You're thinking of carbon. Both pencil lead and diamonds are allotropes of carbon.
graphite in a pencil and diamond are from carbon .both are the allotrope of carbon
The pencil lead is not lead but is made from soft graphite carbon and insoluble except as carbon tetra chloride
It is a case for containing your school material, like rubber, pencils, ruler, markers.