Abstract: Provided is a compound capable of exhibiting different changes in hue with one kind of molecule. The compound has julolidine structures, and is represented by a general formula (1): wherein each of Q and Q1 represents C(R) or N; R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, or a carboxyl group, where two Rs may bind to each other to form a ring; R1 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, or a carboxyl group, where two R1s may bind to each other to form a ring; n represents a number of 0 to 3; and m represents a number of 0 to 3.

Abstract: Provided is a compound capable of exhibiting different changes in hue with one kind of molecule. The compound has julolidine structures, and is represented by a general formula (1): wherein each of Q and Q1 represents C(R) or N; R represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, or a carboxyl group, where two Rs may bind to each other to form a ring; R1 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, or a carboxyl group, where two R1s may bind to each other to form a ring; n represents a number of 0 to 3; and m represents a number of 0 to 3.

Abstract: A printing device, to which a printing material container having an electric device connected two first terminals and a wiring connecting two second terminals can be attached, includes: first and second detection terminals that contact the two first terminals; third and fourth detection terminals that contact the two second terminals; a first detection signal generator that outputs a first detection signal to the first detection terminal; a first detector that is connected to the second detection terminal; a second detection signal generator that outputs a second detection signal to the third detection terminal; a second detector that is connected to the fourth detection terminal; a high voltage generator that outputs high voltage to the first or the second detection terminal; an overvoltage detector; and a voltage drop element arranged between the overvoltage detector and the third or fourth detection terminal.

Abstract: A printing device, to which a printing material container having an electric device connected two first terminals and a wiring connecting two second terminals can be attached, includes: first and second detection terminals that contact the two first terminals; third and fourth detection terminals that contact the two second terminals; a first detection signal generator that outputs a first detection signal to the first detection terminal; a first detector that is connected to the second detection terminal; a second detection signal generator that outputs a second detection signal to the third detection terminal; a second detector that is connected to the fourth detection terminal; a high voltage generator that outputs high voltage to the first or the second detection terminal; an overvoltage detector; and a voltage drop element arranged between the overvoltage detector and the third or fourth detection terminal.

Abstract: Carbon monoxide is reacted with sulfur in the vapor phase at 250.degree.-650.degree. C. to prepare carbonyl sulfide, wherein a reactor is used, in which at least the inner surface is made of an alloy consisting essentially of, based on the weight of the alloy, 20-60% of Cr, 40-65% of Ni, 0-10% of Mo, 0-4% of Nb+Ta, and 0-3% of Fe. The reactor not only possesses good corrosion resistance to the gaseous reaction mixture, but also minimizes the reduction in the purity of carbonyl sulfide produced, which reduction occurs with the lapse of operation time.