Colorless recording paper

A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from an organic sulfinic acid and an N,N'-alkylated-4,4'-diaminobenzhydrol, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print.

A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from an organic sulfinic acid and an arylmethane dye base characterized by a logarithmic dissociation constant below 7.

A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from an organic sulfinic acid and an N,N'-alkylated-4,4'-diaminobenzhydrol.

A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from hydrazoic acid and an arymethane dye base characterized by a logarithmic dissociation constant below 7, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print.

A transfer sheet having upon its surface a coating containing a substantially colorless dye salt derived from hydrazoic acid and an N,N'-alkylated-4,4'-diamino benzhydrol, which upon transfer to a suitable receiving sheet is dissociated to the intensely colored ionic form of the dye to furnish a colored print.

A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from hydrazoic acid and an arylmethane dye base characterized by a logarithmic dissociation content below 7.

A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt derived from hydrazoic acid and an N,N'-alkylated-4,4'-diaminobenzhydrol.

A transfer sheet having upon its surface a coating containing a substantially colorless dye salt wherein the cation is the intensely colored cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7 and the anion is chosen from the group consisting of hydrazoic acid anion and organic sulfinic acid anion.

A transfer sheet having upon its surface a coating containing a substantially colorless dye salt wherein the cation is an N,N'-alkylated-4,4'-diaminobenzhydryl cation and the anion is chosen from the group consisting of hydrazoic acid anion and organic sulfinic acid anion.

A transfer sheet having upon its surface a coating containing the substantially colorless salt of toluenesulfinic acid and 4,4'-Bis (Dimethylamino) benzhydrol.

A transfer sheet having upon its surface a coating containing the substantially colorless salt of xylenesulfinic acid and 4,4'-Bis (Dimethylamino) benzhydrol.

A transfer sheet having upon its surface a coating containing the substantially colorless salt of diethylbenzene-sulfinic acid and 4,4'-Bis (Dimethylamino) benzhydrol.

A manifolding sheet comprising a web having a coating on one side thereof, said coating comprising a solvent and a colorless dye salt wherein the cation is the intensely colored cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7 and the anion is an organic sulfinic acid anion.

[17. A recording paper comprising a base web consisting essentially of intermeshed paper fibers, said fibers impregnated with a recording composition containing as a constituent thereof a substantially colorless dye salt wherein the cation is the intensely colored cation of an arylmethane dye base characterized by a logarithmic dissociation constant below 7 and the anion is an organic sulfinic acid anion.]

[18. A recording paper comprising a base web consisting essentially of intermeshed paper fibers, said fibers impregnated with a recording composition containing as a constituent thereof a substantially colorless dye salt wherein the cation is an N,N'-alkylated-4,4'-diaminobenzhydryl cation and the anion is an organic sulfinic acid anion.]