[Problem] The purpose of the present invention is to provide a method for solving a problem in methods for preparing curdlan gels. For example, provided is a method that makes it possible to improve dispersibility or solubility when viscosity enhancement is carried out at low temperature in a viscosity enhancing method. The present invention also provides a method for improving strength of a formed gel. [Solution] Curdlan and chaotropic ions or urea in the range of 1-1500 with respect to 100 parts by weight of the curdlan are made to coexist.

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