new triarylmetanfergemnen - two heterocyclic groups, their framstellning and anvendning and tryckkensligt registreringsmaterial - the new fergemnena

摘要

New chromogenic material has formula (I) (where A is N and B is CH or A is CH and B is N. The (I) and/or (II) can be used as a partial or complete replacement for crystals violet lactone in press. sensitive registration materials such as carbonless copying papers, typewriter ribbons, etc. They give excellent blue colours with the usual colour developing agents used and are less prone to loss of colour-forming activity after exposure to light.