To provide a colorant comprising natural substances alone in view of the fact that each of water-based pigment dispersions used as a colorant for an aqueous emulsion compound with a synthetic resin includes mineral, metal and/or artificial chemical substance, and there is no colorant comprising natural matter alone.

This pasty colorant comprising natural substances alone is obtained by grinding a silk material followed by dyeing the ground silk material with a natural dye and then making a concentration by making use of a filtration membrane. The pasty colorant thus obtained is utilized as an alternative to a conventional water-based pigment dispersion.