Abstract: Carbonless imaging system containing transfer control agent to prevent undesirable back-transfer of image to transfer medium. The transfer control agent is selected from oxalic acid, phosphoric acid, or mixtures thereof. Transfer media and business forms are also described.

Abstract: 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.