Abstract: A reversibly discoloring ink composition which changes color reversibly and instantly in response to irradiation with light of a given wavelength distribution. The discoloring composition has fine particles comprised of one or more rare earth oxides represented by the general formula M2O3, wherein M is Ho, Nd, or Pr, and a light-transmissive base material having the fine particles dispersed therein. In an embodiment, a color changing decorative layer formed of the reversibly discoloring ink is printed on the upper layer of a dial plate or other wristwatch part.

Abstract: The system is in form of a double-deck video cassette recorder incorporating a video/audio reproducer and a video/audio recorder/reproducer. Reproduced video signal output from the video/audio reproducer is coupled to the video/audio recorder/reproducer via a selector. The video/audio recorder/reproducer is coupled to an externally introduced video signal through a video selector and connected to a mixer that combines reproduced audio signal output with an externally introduced audio signal. In response to reproduction or interruption of the reproduction of the video/audio reproducer, the video/audio recorder/reproducer is activated through a control line to record signals or interrupt it.

Abstract: A salt waste composed mainly of chlorides, which is generated from the step of a molten salt electrolytic purification in dry reprocessing of a spent metallic nuclear fuel, is reacted with boric acid at high temperature to convert the chlorides in the salt waste into oxides. The resulting oxides of the salt waste are easily vitrifiable, and a vitrification product is obtained by adding a vitrifying additive to the oxides, heat-melting the mixture to form a molten mixture and cooling the molten mixture.

Abstract: Heat-sensitive magnetic transfer element for printing magnetic image to be recognized by magnetic ink character reader (MICR), which comprises a heat-resisting foundation and a heat-sensitive transferring layer provided on the foundation, said transferring layer having a melting temperature of 50.degree. to 120.degree. C. and comprising 30 to 97% by weight of a ferromagnetic substance powder, 2 to 69% by weight of a wax and 1 to 68% by weight of a resin. The transfer element gives a printed magnetic image having high accuracy of dimensions and high magnetic properties by thermal printing method.

Abstract: Heat-sensitive magnetic transfer element for printing a magnetic image to be recognized by a magnetic ink character reader (MICR), comprising a heat-resisting foundation and a heat-sensitive transferring layer provided on the foundation, the transferring layer which includes a ferromagnetic substance powder and has a melting point of 50.degree. to 120.degree. C. being readily melted and transferred on a receiving paper in the form of magnetic image by a thermal printer.