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Use "opacifiers" in a sentence
"Transparent glazes can be made opaque by the addition of opacifiers, which are finely ground particles that do not enter into the melting of the glaze."
"Zirconium opacifiers have the disadvantage of making glazes more refractory and often cause pinholing problems."
"Commercially available opacifiers are based on zirconium silicate, prepared with other additions such as magnesia and zinc oxide."