10.0 per cent. 10 per cent. I. All glaze Glass II. All body Fused silica Terracotta Filter candles, bricks roofing tiles, etc. III. Body and glaze (a) Clear glaze Porcelain Stoneware Chemical Bristol stoneware Salt-glazed pipes (6) Crystalline glaze Parian Carrara (o) Clear over Persian engobe white glazed