Red - A body formed from
red or colored clay, visible if unglazed and invisible
if glazed. Red clays owe their coloring to the presence
of other minerals such as iron and other oxides, organic
material, etc.
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White - White clays differ from red
clays in their careful extraction and in their lack of
other minerals, which also guarantees uniform properties
in supplies from different sources. Also, the temperatures
used in the firing of white clay products are usually
higher than those of red clay, products which together
with the better quality and uniformity of the raw materials
and the greater security of the manufacturing process,
give tiles of white clay technical and aesthetic advantages
over those of red clay.
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