| 摘要 |
PROBLEM TO BE SOLVED: To obtain a planographic printing original plate which is easy to handle, in spite of its high sensitivity. SOLUTION: In a planographic printing original plate obtained by laminating an aluminum base, a physical developing nucleus layer and a silver halide emulsion layer in this order, the silver halide emulsion layer is colored, in such a way that the light transmittance at a wavelength of 440-600 nm is adjusted to lower than 50% or a colored layer having lower than 50% light transmittance at a wavelength of 440-600 nm is disposed on the silver halide emulsion layer. |
