推荐回答(3个)
看刀工、断代只是协助看出土古玉生熟、看色沁断代。历代刀工雕法、纹饰器型虽都有创新但也都有模仿,秦汉仿三代刀工,宋仿秦汉直至三代刀工。
夏、尚、周三代刀工的共同特点是器大而无工,器小而满工,三代刀工很细有时跳刀,称为牛毛纹昆吾刀工。雕法大部分是双阴线“勾撒”雕法,纹饰有阴刻重环纹、方格纹、花瓣纹、鸟纹等等,器型大部分为礼器和龙型壁等。但三代刀工也有区别,夏朝刀工纹饰满工而刻纹刻线精而深,器型表面不平,商朝刀工纹饰满工而纹饰古朴,器型表面大部分不平。周朝刀工纹饰满工而器型纹饰文雅,器型薄而表面平。
春秋战国刀工仿三代刀工但雕法和纹饰增多。有三代的勾撒法、减地雕法、对称雕法和出廊雕法等。纹饰有云纹、谷纹、绳纹、“山”形纹和云雷纹等。
秦汉刀工不但仿前代刀工而且还创新了一种粗犷、厚实、流畅、简洁的汉八刀。一件玉器或玉佩雕刻八刀左右即成器,汉八刀的典型玉器有汉蝉、握猪、翁仲等。二晋六朝刀工在仿制前代刀工的同时还创新了一种羽翼龟称腾蛇,腾蛇又名飞龙(无足能飞),此腾蛇鳌头鸱尾,我想这大概是我国雕刻和绘画艺术中集两种动物于一身的创作。
唐宋刀工并无创新,只是宋代螭纹露颈、螭头圆形的特点。宋徽宗自身嗜玉,仿古玉器甚多。明朝刀工的发展是创新了镂空层雕法,其雕法刀工细腻精致、变化多端。清朝刀工精工刻法,刀工细、层次多、琢工好、精而薄。但明(朝)、清(朝)的刀工对鉴定出土古玉已无多大用处,因明、清二代出土古玉已无出土古玉的特征,如果一件玉器是明清二代的刀工雕法而此玉器生有色沁,那么这件玉器的刀工雕法和玉器的年纪产生矛盾,所以这件玉器肯定是仿的了。
看线条不容易掌握,就从雕刻的痕迹看就行了,现在雕刻工艺都是半手工的,就是电机带动雕刻工具高速旋转在玉石上按照画好的线条进行雕刻,专业的雕刻工具还能根据需要调节电机的转速,但不论怎样调,在玉器打孔的部位,仔细观察孔内的痕迹,就能发现工具的转动痕迹,一些打磨工艺不好的玉器,在雕刻的部位有时也能发现这样的痕迹。但是老工艺的雕刻方法就不同了,古代都是用砣机在需要雕刻的部位撒上磨玉砂,再一点点的用脚蹬着慢慢磨出来的线条,再久远些还有用纯手工磨制的,这样的磨法往往要几个月甚至更长时间才能出来一件玉器,那磨制的部位非常光滑,圆润,几乎没有磨痕,在打孔的部位观察孔的里面也是这样的,有时孔里还会出现“台阶”这是因为打孔时是两面对着打,位置偏差照成的。总之你要是在玉器上发现工具留下的磨痕,大多是新工艺。就算是仿古造假的玉器,那造假人也不会花上三月半年的手工去做一件玉器,肯定是用现代的雕刻工具完成雕刻,在做旧仿古。
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