The colour difference between the exterior and the interior of the sherds is a result of two factors. The blackness of the interiors of the sherds is caused by the is normal with utilitarian pottery made for domestic use in agrarian societies today. Low temperatures(800 degrees Celcius) and a short duration of firing(usually no more than four hours) resolt in the incomplete oxidization of carbon, which occurs naturally as the result of the presence of organice matter in the clay sediments exploited by the potters. The exteriors turn white, red or pink, because the exterior surfaces are exposed to more oxygen from the surrounding air, and become hotter, and because the potters often coated their post with slip, a mixture of water and clay of purer Consistency than that used for the main body (Singpore's early potters probably used clay from two sources: one that contained more impurities, and one that was composed mainly of nearly pure Kaolin, which the nineteenth-century reports show could be obtained between Stamford and Bras Basah Roade, near Fort Canning Hill. In this way a white vessel could be obtained. A few sherds from Singpore indicate the use of a red slip. This could be obtained by including some iron.
The colour difference between the exterior and the interior of the sherds is a result of two factors. The blackness of the interiors of the sherds is caused by the is normal with utilitarian pottery made for domestic use in agrarian societies today. Low temperatures(800 degrees Celcius) and a short duration of firing(usually no more than four hours) resolt in the incomplete oxidization of carbon, which occurs naturally as the result of the presence of organice matter in the clay sediments exploited by the potters. The exteriors turn white, red or pink, because the exterior surfaces are exposed to more oxygen from the surrounding air, and become hotter, and because the potters often coated their post with slip, a mixture of water and clay of purer Consistency than that used for the main body (Singpore's early potters probably used clay from two sources: one that contained more impurities, and one that was composed mainly of nearly pure Kaolin, which the nineteenth-century reports show could be obtained between Stamford and Bras Basah Roade, near Fort Canning Hill. In this way a white vessel could be obtained. A few sherds from Singpore indicate the use of a red slip. This could be obtained by including some iron.
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