To solve the problem that a conventional method for getting silk protein inevitably lowers the molecular weight of silk protein due to heat treatment or the like, the silk protein, however, is easy to dissolve in water when the silk protein is lowered in molecular weight, so it can not be used singly when used as a modifier for gloves, accordingly, a fixing agent, treatment, or the like for fixation is required separately.

It is possible to process a glove without a fixing agent or without performing treatment for fixation using high molecular weight sericin liquid high in absorbability which is extracted by soaking silk thread in an ultrasonic vibrator tank using strong alkaline ionized water as a solvent in normal temperature state.