Undecorated pearlware vessels were considerably less common than decorated varieties, and many archaeologically-recovered sherds without decoration were undoubtedly fragments from decorated wares. The paste of pearlware produced after 1810 was heavier and whiter than earlier examples, and had a harder lead glaze, varying in color from almost clear to deeply bluish tinted.
White to light cream-colored, thin, hard, compact paste. White to faint bluish white clear lead glaze, caused by the addition of cobalt to the glaze. Bluish cast where glaze pools.
Hume 1969 and Sussman 2000 were also listed on the FLMNH website but the bibliographic information was not provided.