Porcelain Labware: Evaporating Dishes, Crucibles, Funnels and Streak Plates

Hard porcelain stands strong heat and most chemicals, so the laboratory's dishes, crucibles and filter funnels are made of it; left unglazed, its white biscuit is the streak plate for testing minerals. Form the pieces, give them a light first firing, dip them in ground-felspar glaze, and fire them hard in saggers, as Andrew Ure (1839) describes for Sèvres. The picture: porcelain evaporating dishes in three sizes, glazed, with pouring lips.