Concept:
Silica is one of the most important ingredients in ceramic glaze chemistry.
Its primary role is:
• Glass formation
• Surface vitrification
• Transparency development
•
Step 1:
Silica acts as the principal glass former in ceramic glazes.
It melts during firing and creates:
\[
Glassy surface coating
\]
Thus:
\[
C \text{ is correct}
\]
•
Step 2:
Silica itself does not directly:
• Produce colour
• Create opacity
• Generate matte surface
These effects are usually caused by other glaze additives.
\[
\boxed{\text{(2) C Only}}
\]