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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 has a relatively soft, porous body that would not contain liquids without a glaze.
The vessel was fired at a relatively low temperature, in the range of 1,000 to 1,200 degrees C.
If the surface feels sticky, then it is earthenware.The purpose of this guide is to provide a general introduction to some of the historic artifacts recovered from archaeological sites in the Upper Sangamon Basin of east-central Illinois.Most of the field work has focused on the Mahomet area, but these sites are considered typical of material from the larger study area.The vitrification process involves the temperature and conditions under which the particles of clay fuse.The high temperature has the effect of changing the physical properties of the clay so that it, for instance, will not dissolve to mud when exposed to water.
Materials from these categories are both the most frequently encountered and the most useful for assigning dates. Ceramics are objects that are made from baked clay.