Abstract: A pack of paper suitable for use in xerographic, ion deposition of magnetographic printing processes, the pack including a stack of paper sheets having a moisture content of not more than 6% and a reclosable carton made of semi-stiff sheet material and comprising a container portion containing said stack, and a closure portion, said container and closure portions having mutual parallel planar surfaces which slidably interengage upon closure of the carton to restrict air ingress to the carton there-between, and means for limiting the (WVIR) to not more than 30 grammes per square meter of the surface area of the carton in 24 hours at 90% Relative Humidity and a temperature of 32.degree. Celsius.

Abstract: Self-contained pressure-sensitive copying material having a coating which contains both a particulate mineral color-developing material and microcapsules enclosing a solution of a colorless color former which is reactive with the color developing material to produce a colored product, in which the particles of color developing material (e.g. an acidic clay) and optionally the microcapsules as well, are chemically treated with a protective agent to inhibit premature color development wherein the protective agent may be a self-crosslinkable polymer, such as an aminoplast polymer (e.g. a urea-formaldehyde or melamine-formaldehyde polymer), or an epichlorohydrin polymer (e.g. an aminoepichlorohydrin or an amide/aminoepichlorohydrin polymer), or an anionic surfactant (e.g.

Abstract: A method of producing self-contained pressure-sensitive copying material having a coating which contains both a particulate mineral color-developing material and microcapsules enclosing a solution of a colorless color former which is reactive with the color developing material to produce a colored product, in which the particles of color developing material (e.g. an acidic clay) and optionally the microcapsules as well, are treated with a protective agent to inhibit premature color development. The protective agent may be a self-crosslinkable polymer, such as an aminoplast polymer (e.g. a urea-formaldehyde or melamine-formaldehyde polymer), or a epichlorohydrin polymer (e.g. an aminoepichlorohydrin or an amide/aminoepichlorohydrin polymer), or an anionic surfactant (e.g.