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FRIT – is commercially prepared by combining water soluble fluxes such as; Alkali Carbonates, Nitrates, Borates, etc., with Silica, which are then fused and ground to a predetermined particle size to render the fluxes insoluble. Harmful compounds such as Lead are also fritted to reduce their toxicity. Frits can be used in both clay bodies and glazes when introduction of water soluble and/or toxic elements is desired.