The aim of this research is to investigate the influence of NaCl on the colours and chemical composition of Ca-rich ceramic bodies. The addition of salt to ceramics is a practice that has been observed in several potter communities where the addition of salt is explicitly intended to whiten ceramics. In order to conduct this research and characterize the physico-chemical properties induced by the presence of salt, raw clay material and pot sherds were collected from the modern production at Hebron. Experimental bricks were made using two clayed sediments: one with a low CaO content (<10%) and one with a higher CaO content (20–25%). Different proportions of NaCl were added (up to 5%) to clay pastes which were fired at different temperatures. Mineralogy (petrography, XRD), chemistry (SEM-EDX) and colour analyses were carried out on raw clay materials, pot sherds and experimental (lab-made) bricks. SEM imagery offered the possibility to monitor the evolution of the mineralogical transformations, the pore system with increasing firing temperature and salt content. Results confirm the role of salt as a catalyst in the transformation reaction of calcium silicates during the firing process and its influence on the colour of the finished object.

本研究的目的是研究 NaCl 对富钙陶瓷体的颜色和化学成分的影响。在陶瓷中添加盐是在几个陶艺社区中观察到的一种做法，在这些社区中，添加盐的目的是使陶瓷变白。为了进行这项研究并表征由盐的存在引起的物理化学性质，从希伯伦的现代生产中收集原料粘土材料和陶罐碎片。实验砖使用两种粘土沉积物制成：一种具有低 CaO 含量（<10%），另一种具有较高的 CaO 含量（20-25%）。将不同比例的 NaCl（最多 5%）添加到在不同温度下烧制的粘土糊中。矿物学（岩石学，XRD），化学 (SEM-EDX) 和颜色分析是对原始粘土材料、锅片和实验（实验室制造）砖进行的。SEM 图像提供了监测矿物学转变、孔隙系统随烧制温度和盐含量增加的演变的可能性。结果证实了盐作为催化剂在烧制过程中硅酸钙的转化反应中的作用及其对成品颜色的影响。