abstract |
MERCURY THIOCARBAZONE COMPOUNDS DISPERSED IN A SOLIDIFIED PLASTICIZED RESIN COMPOSITION CONSISTING ESSENTIALLY OF VINYL CHLORIDE COPOLYMERIZED WITH, E.G., NOT LESS THAN 5 MOL PERCENT OF VINYL ACETATE AND LAMINATED IN A SANDWICH BETWEEN TWO TRANSPARENT GLASS OR PLASTIC LAYERS PROVIDE LENSES WITH EXTREMELY RAPID COLOR RESPONSES TO INCIDENT LIGHT AND REVERSION TO DARK-ADAPTED STATES. |