The little jar is made out of Alabaster and was used to hold kohl. Kohl is a black makeup that the Egyptians used to decorate their eyes. If you look closely at the lid, you can see that there is a small bump that fits into the neck of the jar to stop the air getting in. The Egyptians decorated their eyes not just to make them look attractive but also to protect them from the glare of the sun and to keep flies away. The style of eye make up most popular looked liked the 'Eye of Horus'. You can see what that looked like by finding the Eye of Horus charm, which is somewhere else in this room.