Abstract: A transparent insert holder of the type characterized by being adapted to receive and protect cards such as photographs, permits and the like. The insert holder includes first and second four-edged plastic cover sheets for forming front and back surfaces of the insert holder. The first plastic cover sheet has a predetermined-sized transparent window therein defined by a surrounding non-transparent area, and a four-edged, double-sided frame is provided for being positioned between the first and second plastic sheets for securing the first and second sheets to opposing front and back sides of the frame to form the holder. The frame has a pressure sensitive adhesive coating the frame on its front and back surface. The first cover sheet is secured to the frame by the pressure-sensitive adhesive to completely enclose one of the front or back surfaces of the frame.

Abstract: A waste solution containing heavy metals tightly bound by complexing agents such as EDTA, NTA, and thiosulfate is treated by contacting the solution with a mixture of peroxide and ozone to oxidize and destroy the complexing agents thereby facilitating separation and recovery of the heavy metals and reducing pollution of streams by the heavy metals.