Record material

A record material which utilizes a color forming reaction between a substantially colorless chromogenic material and an electron accepting reactant material, comprising the improvements of

• a mixture of a first component being at least one phthalide compound having two vinyl linkages and
• a second component of another kind of chromogenic material, said first component being used in an amount of 5 to 80% by weight with respect to the amount of said second component and whereby the reflectance at any wavelength within the range of 580 nm to 880 nm of color images developed by said color forming reaction is at least 55% less than that of said record material before color developing, said phthalide compound being represented by the following formula, ##STR16## wherein each R.sub.1, R.sub.2 is alkyl which may be substituted by halogen, alkoxyl or acetyl, alicyclic, aryl which may be substituted by halogen, alkyl or alkoxyl, aralkyl which may be substituted by halogen, alkyl or alkoxyl, or one or both of R.sub.1 and R.sub.2 together with the adjacent nitrogen may form a heterocyclic ring;
• R.sub.3 is hydrogen, halogen, alkyl, alkoxyl or acyloxy;
• R.sub.4 is hydrogen or alkyl;
• and each of a, b, c, and d is carbon or nitrogen atom, but at least two of them are carbon atoms which may be substituted by hydrogen, halogen, alkyl, alkoxyl, dialkylamino or nitro, and an a--b, b--c, or c--d bond may form a part of another aromatic ring.