Abstract: A spill resistant container for light weight powders is disclosed. The container has retaining members which allow a fine powder to be retained in the container when the container is dropped or knocked over. The present invention also discloses a top for a common household jar which can be modified to allow for use as a spill resistant container. The container has a first retaining member in the shape of a conical section with the large opening at the upper end, and a second retaining member positioned above the first retaining member.

Abstract: A vacuum chamber is provided for the development of latent fingerprints, having a first and second end, and end plates sealing the first end, a removable end plate for sealing the second end to form a vacuum chamber by assembly of the wall end plates. In addition, the chamber wall and end plates define three passageways, a vacuum gauge passageway, an inlet passageway and an outlet passageway. The outlet passageway is connected to a conduit which is connected to the inlet of a vacuum pump. The outlet of the vacuum pump is connected to a conduit connected to a valve assembly, and the valve assembly is connected to a recycle conduit, and the recycle conduit is connected to the inlet passageway. The valve assembly has a first position whereby gases within the chamber are vented to the atmosphere and recycle is prevented, and a second position in which recycle of gases remaining in the chamber is permitted while venting to the atmosphere is prevented.