Patent ID: 8540945

Claim:
A method for producing a multi-layer water absorbing material comprising a granular core portion for absorbing moisture from outside and a coating layer portion coating the granular core portion, the coating layer portion containing an excretion test indicator being a reagent that changes its color upon reaction with excretion, the method comprising: a granulation step of producing the granular core portion, an excretion test indicator adsorption step of dissolving the excretion test indicator in a solvent for dissolving the excretion test indicator and allowing the dissolved excretion test indicator to be adsorbed on a porous adsorbent having an adsorbance of 25 wt % or greater and including micropores, a coating material production step of adding the excretion test indicator adsorbed, by the excretion test indicator adsorption step, on the porous adsorbent to a substrate to produce a coating material that constitutes the coating layer portion, and a coating step of coating the granular core portion with the coating material.