Abstract: A heat- and light-sensitive recording material has a substrate and a color-forming layer which comprises a particular fluoran-type leuco dye.This heat- and light-sensitive recording material provides a clear image a superior contamination-resistance and an excellent readability in visible and near infrared range.

Abstract: A heat-sensitive recording material has a support and a color-developing layer which comprises both as a colorless basic chromogenic dye at least one of a particular fluorane-type leuco dye and a particular divinyl compound and as a stabilizer a particular halogen-substituted zinc benzoate derivative.This heat-sensitive recording material is superior in light resistance, weather resistance, oil resistance and optical readability in the near infrared region.

Abstract: A heat-sensitive recording material has a substrate and a color-developing layer which comprises a near infrared-absorbing fluorantype leuco dye.This heat-sensitive recording material provides a superior optical readability in near infrared region.

Abstract: A heat-sensitive recording material including a support and a color-developing layer having both an electron donor and a metal double salt or higher fatty acid having 16-35 carbon atoms as an electron acceptor. The heat-sensitive recording material is superior is dispersibility, image contrast, oil resistance, solvent resistance and optical readability in the near infrared region.

Abstract: A heat-sensitive recording material comprises a support and a color-developing layer having both a particular saturated higher fatty acid iron salt and a particular polyvalent phenolic derivative. The heat-sensitive recording material provides a superior thermal response and a high stabilty of the developed image.

Abstract: A thermosensitive recording sheet having a thermosensitive color developing layer containing a basic leuco dye and an organic color developer, said organic color developer consisting of at least partly of a halogen-substituted benzoic acid zinc salt represented by the following general formula ##STR1## wherein X.sub.1 represents a halogen atom, X.sub.2 represents a hydrogen or halogen atom, and R.sub.1, R.sub.2 and R.sub.3, independently from each other, represent a hydrogen atom or an alkyl, alkoxy, cycloalkyl, nitro, cyano or hydroxyl group.