disclosed is a recording material which comprises a normally colorless or palely colored dye precursor and a developer which causes the dye precursor to form color upon contact with the dye precursor , said developer being a copolymer of a styrene monomer with at least one monomer selected from the group consisting of a vinylsulfonic acid type monomer , a acrylic type phosphorous - containing monomer and a acrylic acid type monomer . this recording material is excellent in stability of color image portion and non - image portion .