The common procedure for identifying earthenwares is by touching the tongue to the paste.
If the surface feels sticky, then it is earthenware.
Tin-enameled glaze wares are known by different names generally depending on their country of origin.
Material produced in France and Italy is known as faience, material from Spain is labeled majolica, and objects from England and Holland are referred to as delft.
They are often "crazed" or covered with a web of cracks.
As the earliest American pottery, redware dates from 1725 through the present (Ramsay 198).
Most of the field work has focused on the Mahomet area, but these sites are considered typical of material from the larger study area.
Common surface treatments by other producers included: undecorated, plain; clear lead glaze; lead with manganese glaze (brown or black color) (1, 2); and a white or yellow slip under a clear lead glaze.
Ramsay (198-138) recognizes 38 types of redware and a wide variety of object forms.-Faience is an earthenware featuring a tin-enameled (stanniferous) glaze. In the traditional production trajectory (grand feu), the clay vessel was first fired to produce a "biscuit." The undecorated biscuit was then painted or dipped in the tin-enamel glazing mixture, dried, decorated with hand painted metallic oxides, and fired a second time.
Earthenware is the softest and least vitrified, stoneware the next most, and porcelain is the hardest and most glass-like.
Within each of these categories one would find variations in surface treatments.