بالنسبة للبلاستينج ماتيريال اللي كان يستخدم في مكة ايام زمان كان اسمها النورة
وهي حجارة بيضاء كلسية تنقع في الماء للتحول لمادة قابلة للدهن
وكان مصدر خام النورة في منطقة شمال مكة في طريق المدينة اسمها النوارية والله اعلم
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انظر هنا لقد بحثت لك ولكن باللغة الانجليزية
Plaster
Plaster of Paris, or simply
plaster, is a type of building material based on
calcium sulfate hemihydrate, nominally CaSO4·0.5H2O. It is created by heating
gypsum to about 150 °C.
2CaSO4·4H2O → 2CaSO4·H2O + 3H2O (released as steam).A large gypsum deposit at
Montmartre in
Paris is the source of the name. When the dry plaster powder is mixed with water, it re-forms into gypsum. Plaster is used as a building material similar to
mortar or
cement. Like those materials plaster starts as a dry powder that is mixed with water to form a paste, which then hardens. Unlike
mortar and
cement, plaster remains quite soft after drying, and can be easily manipulated with metal tools or even
sandpaper. These characteristics make plaster suitable for a finishing, rather than a load-bearing material.
http://en.wikipedia.org/wiki/Plaster
