Acidic oxides are oxides displaying acidic properties in ceramic fusions. They are Silica and phosphorus oxide. A number of other oxides, which are mostly dioxides, display some acidic properties in ceramic fusions. However they also display amphoteric properties which make it difficult to assess the unity formulae in which they appear. Those with strong acidic properties are:
Boron oxide
Titanium oxide
Tim oxide
Zirconium oxide
Cerium oxide
Vanadium oxide
Germanium oxide
Those with slight acidic properties are:
Antimony oxide
Arsenic oxide
Praseodymium oxide
Two other oxides display acidic properties in the raw state but change their oxidation during firing to become alkaline in character. They are:
Manganese dioxide
Lead dioxide
Manganese dioxide becomes manganese monoxide at 1080c. Lead dioxide is part of the lead compound called red lead. It becomes lead monoxide at 600c.

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