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故宫瓷器考：

原始瓷青釉划花双系壶，西汉，高32.5cm，口径14.2cm，底径13.6cm。
    壶撇口，长颈，溜肩，肩部对称置双系，鼓腹，平底略内凹。通体施青釉。肩部以划花变形凤鸟纹装饰。颈、肩及腹部划有弦纹5道。
    此壶造型敦厚古朴，纹饰简练，釉厚而色深，是典型的西汉原始青瓷向东汉成熟青瓷过渡期的产物。
    原始青瓷出现于约3000年前的商代，历经西周、春秋、战国、汉代，它是从陶向瓷过渡时期的产物，系从印纹硬陶发展而来。其制法是用瓷石制胎，器表施石灰釉，经1200℃高温焙烧而成。胎体烧结后呈灰白或褐色，器表有玻璃质釉层。胎体吸水率低，敲击时能发出清脆的声音。原始青瓷上的釉都呈青色，这是由于釉中含有适量氧化铁所致。原始青瓷与陶器虽已有本质的区别，但在烧造工艺上与真正的瓷器相比还具有一定的原始性，故称“原始青瓷”。
    西汉原始青瓷的胎体一般呈灰白色或深灰色。其釉层普遍较厚，色调偏深，多呈青绿或黄褐等色。装饰纹样则有弦纹、水波纹、云气纹等，壶、罐等器物上多置双系或铺首。