We have developed a new method of urushi purification by three-roll mill made of stone or ceramic which could be substituted for Nayashi and Kurome. Sukeurushi (clear urushi) obtained by this method has short drying time, low viscosity, good transparency without turbidity, high hardness and high gloss.
These characteristics are resulted from a good dispersion of water with water-soluble polysaccharide and laccase and little effect in the molecular weight of urushiol and in the activity of laccase.
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