Na2O×2B2O3×10H2O—a major LT alkaline flux, available in granular or powdered form.  Gives smooth finish, bright colors. Water soluble, so is often used in fritted form. In excessive amounts creates brittle glass and can cause blistering and pinholing. Available in granular and powdered form. Sometimes used with salt or soda in vapor glazing to lower firing temperature and/or achieve a smoother, shinier surface. Toxic in inhalation and ingestion. Source: Clay: A Studio Handbook

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