Abstract: A method of measuring ozone concentration, comprising the steps of: preparing an ozone indicator comprising at least (1) a color-change layer comprised of an ozone sensitive ink and (2) an overcoat layer formed on part or the whole of the surface of the color-change layer; disposing the ozone indicator in an ozone atmosphere; and calculating a CT value from color difference or size of color-change zone resulting from color change of the color-change layer.

Abstract: An oily ink for writing instruments comprising

Abstract: There is provided a plasma sterilization indicator enabling an accurate detection of the end-point of plasma sterilization. This invention relates to a plasma sterilization indicator comprising a support and, as formed thereon, a color-change layer comprised of a variable color ink composition containing an anthraquinone dye having at least one kind of amino groups, primary and/or secondary.

Abstract: A writing instrument has an ink containment tube and a pen tip equipped at one end of the ink containment tube with an oily ink contained in the ink containment tube. The oily ink shows pseudo-plasticity fluidity and comprises a colorant, a resin, an organic solvent and a gelling agent.

Abstract: There is provided an ozone indicator capable of measuring ozone concentration even in an ozone atmosphere of high ozone concentration. The invention relates to an ozone indicator comprising at least (1) a color-change layer comprised of an ozone sensitive ink and (2) an overcoat layer formed on part or the whole of the surface of the above color-change layer and to a method of measuring ozone concentration by using the same.

Abstract: An oily ink for writing instruments comprising

Abstract: An oily ink for writing instruments comprising e. colorant, f. resin, g. an organic solvent and h. a gelling agent, wherein the said gelling agent comprises a soluble gelling agent with the solubility of from about 0.1 to about 20% by weight at a temperature of 20° C. to the said organic solvent, and the viscosity of the ink is not less than 700 mPa·s when the rate of shear is 0.1 (1/s) and not greater than 500 mPa·s when the rate of shear is 100 (1/s).

Abstract: The invention provides a method of detecting ozone expediently and with high sensitivity. The invention, therefore, is directed to an ozone indicator comprising (1) at least one color-change layer comprised of an ozone sensor ink and (2) at least one non-color change layer both formed on a substrate, said color-change and non-color-change layers being formed in such a manner that at least a part or the whole of at least one color-change layer can be exposed to an ozone-containing atmosphere when the ozone indicator is put to use. The invention is further directed to an ozone sensor ink containing an anthraquinone dye having at least one amino group selected from primary and secondary amino groups.

Abstract: There is provided a plasma sterilization indicator enabling an accurate detection of the end-point of plasma sterilization. This invention relates to a plasma sterilization indicator comprising a support and, as formed thereon, a color-change layer comprised of a variable color ink composition containing an anthraquinone dye having at least one kind of amino groups, primary and/or secondary.

Abstract: The invention provides a method of detecting ozone expediently and with high sensitivity. The invention, therefore, is directed to an ozone indicator comprising (1) at least one color-change layer comprised of an ozone sensor ink and (2) at least one non-color change layer both formed on a substrate, said color-change and non-color-change layers being formed in such a manner that at least a part or the whole of at least one color-change layer can be exposed to an ozone-containing atmosphere when the ozone indicator is put to use. The invention is further directed to an ozone sensor ink containing an anthraquinone dye having at least one amino group selected from primary and secondary amino groups.