Question:
Which of the following is not an Opacifier?
Which of the following is not an Opacifier?
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Opacifiers make glaze opaque by scattering light. Zinc oxide is mainly a flux/glaze modifier, not a primary opacifier.
Updated On: May 7, 2026
- \(As_2O_3\)
- \(Sb_2O_3\)
- \(ZnO\)
- \(TiO_2\)
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The Correct Option is C
Solution and Explanation
An opacifier is a material added to glaze or ceramic body to make it opaque.
Opacifiers scatter light and reduce transparency.
Common opacifiers used in ceramics include:
\[
TiO_2,\quad SnO_2,\quad ZrO_2,
\]
and some other oxides.
Antimony oxide and arsenic oxide have also been used historically in certain ceramic glaze compositions.
Zinc oxide:
\[
ZnO
\]
is mainly used as a flux or glaze modifier.
It helps in melting and improving glaze surface properties.
It is not primarily used as an opacifier in this context.
Therefore, the substance which is not an opacifier is:
\[
ZnO.
\]
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