| abstract |
The present invention provides a color-developing composition comprising a color-developing composition containing a compound represented by the following formula (1), and a lithographic printing plate precursor containing the color-developing composition in an image recording layer, However, in the formula, each symbol is as described in the specification. Furthermore, it is possible to provide a lithographic plate which is excellent in visibility due to color development, maintains excellent visibility over time, exhibits good on-press developability, is excellent in white light stability, and is also good in printing durability and color tone reproducibility. A printing plate precursor and a method for producing a lithographic printing plate using the above-mentioned lithographic printing plate precursor. Furthermore, it is possible to provide a color-developing compound having excellent color-developing properties and little discoloration over time. The compound represented by the formula 1 has at least one group represented by the following formulae (2) to (4) as R 4 or R 5 , or among R 1 , Ar 1 or Ar 2 , wherein in the formula , each symbol is as described in the manual. [Chemical formula 1] [Chemical formula 2] . |