Chromogenic compounds of normally colorless form are disclosed having the following structural formula: ##STR1## wherein E represents a six-membered aromatic or heterocyclic ring which may have an aromatic ring or a naphthalene ring and both the E ring and the condensed ring may be substituted, A respresents an optionally substituted aminophenyl, indolyl, benzoindolyl, julolidinyl or kairolyl radical or the radical represented by B, and B represents a family of indolizine radicals. The compounds of this invention are eligible for use in pressure-sensitive and heat-sensitive record materials and manifold marking systems.
披露了通常无色形式的显色化合物,其具有以下结构式:##STR1## 其中E代表一个可能具有芳香环或
萘环的六元芳香或杂环,E环和缩合环均可被取代,A代表可选取代的
氨基苯基、吲哩基、苯并吲哩基、茱洛啶基或卡伊洛基基团或由B代表的基团,B代表吲哩啉基团的一类。本发明的化合物适用于压敏和热敏记录材料以及多重标记系统中的使用。