A composition capable of reducing image-offset when used in combination with color-forming compounds which are capable of forming colored images with color-developing coreactants. The composition comprises an aliphatic tertiary amine image-offset control agent. Color-forming compounds such as dithiooxamide, dithiooxamide derivatives and certain aromatic substituted hydrazones, may also be included in the composition. The invention when employed in the art of carbonless paper enables the production of dark, black images in areas of a paper substrate containing color-forming compositions and transition metal color-developing compositions, without image-offsetting in areas not containing both the color-forming compound and the color-developing compound, even upon stacking color-forming compound containing sheets on top of color-developing compound containing sheets.
A latent image development system comprising a substrate having a latent image thereon and an instrument for dispensing a color developing agent over the image. The image contains a carboxylic or organic sulfonic acid salt of zinc, mercury, copper, iron, cobalt, aluminum or titanium and a binder for the salt. The dispensing instrument contains diiphenylcarbazone or a ring substituted diphenyl carbazone derivative. Also disclosed are a crayon for use in developing a latent image, an ink for producing the latent image, a method for producing the crayon, and a system for use in printing and developing a latent image system.
A carbonless paper construction for imaging via electrophotographic copiers comprising microcapsules encapsulating solvents of dialkyl esters of aliphatic dibasic organic acids, polyglycol ethers and alkyl ethers of monobasic aromatic acids.
A marking system that advantageously minimizes messiness during use is disclosed. The marking system comprises a marking composition comprising at least one color precursor in the form of a leuco dye. A marking instrument can be utilized to store the marking composition and/or apply the marking composition to a desired substrate. The substrate is provided with a coating comprising at least one color-triggering developer. Upon application of the leuco dye to the substrate, a chromophore, and hence, color, is formed. If, however, color is inadvertently triggered on an unintended surface, thereby resulting in an unwanted stain, the stain can be readily removed.
