Abstract: A method and apparatus for eliminating electric charges in a clean room is disclosed involving removing fine and superfine grains from air in the clean room, and generating ions in the thus purified air inside the room.

Abstract: An arrangement for cleaning ventilation air coming from a paint spray booth and polluted with paint particles is provided with a liquid flow for separating part of the paint particles from the ventilation air and a wet electrostatic precipitator for separating any remaining paint particles and liquid droplets from the ventilation air. The electrostatic precipitator is located in an enclosure underneath the floor of the spray booth, with a surface of the enclosure being poured over with the liquid flow to remove part of the paint particles. The enclosure is further designed so that the ventilation air from the spray booth is caused to be deflected through an angle of 10.degree.-170.degree. in relation to the substantially vertical direction of flow through the spray booth before passing through the liquid flow and into the electrostatic precipitator.

Abstract: A thermally developable light-sensitive material comprising a support and containing at least (a) an organic silver salt, (b) a photocatalyst, (c) a reducing agent and (d) a color toning agent in the support or in at least one layer provided on the support, wherein the color toning agent is at least one 2H-1,3-benzothiazin-2,4(3H)-dione, e.g., having the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.