Carbonless paper and revealing corresponding color recording.

Discloses a color developer paper for carbonless recording apparatus, comprising a clay mineral smectite having a specific chemical composition, a particular X-ray diffraction image in the octahedral smectite, a NMR spectrum specific solid state and a capacitance specific cation exchange. This color developer has a high whiteness, a high density of initial color, excellent resistance to light and weathering and a low viscosity.