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第102章 建盏4(第1页)

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宋达又从手机里翻出另外一张照片“你看这只建盏,毫锋长而锐利,浅褐色到银色兼有,排列疏落有致。还有这一只,斑纹圆且更大,呈褐色。‘油滴’和‘星’都是日本对鹧鸪斑的主观描述,日方还把兔毫盏称为‘禾目(稻穗)’。”

蓝桉惊讶地眨了眨眼,“‘星’?这个叫法好浪漫啊!”

宋达继续说“‘星’的说法或来源于《君台观左右帐记》中的记载,而油滴的说法更为主流。把油滴盏叫做星建盏,是德川家传的说法。照片里这只建盏的油滴小而密,别样美感。扣边是扁平的扣法,在日藏盏中不多见。”

蓝桉点点头,“大叔,跟您聊天我真的收获颇多。之前我在淘宝上搜索建盏,但总感觉跟您店里的有些不大一样。”

宋达摆摆手,“淘宝上卖的其实都不是建盏,那只是挂着羊头卖狗肉罢了。近年来,建盏的艺术价值和历史文化价值得到了越来越多人的认可,不只是老盏,很多品质不错的新盏,价格也在不断攀升。建盏的烧制讲究窑内功夫,成品率很低,每一只都不同,都有自己的个性,很多刚入门的朋友都不知道怎么去挑选建盏。”

蓝桉有些疑惑,“那究竟要怎么挑选建盏呢?”

宋达很大方地倾囊相授,“我们要挑选一只建盏,先要立足根本,考虑建盏的本质特征和必备特征,那就是铁胎,要记住,无铁胎,不建盏。铁胎主要是用建阳水吉当地的高铁红土当原料的,含铁量比其他窑口都高。

“其他窑口多数用偏黄白色的高岭土,这种土含铁量很少,含铝比较多,做出来的是瓷胎。铁胎更重,耐火度、可塑性都不如瓷胎,瓷胎可以避开铁胎才会有的变形开裂等问题,建盏成品率低的原因之一就是因为这个。

“不是铁胎,还要假装铁胎的事,在宋代就有了,给露胎部分涂化妆土,把白胎涂黑。现代即使不抹专业化妆土,抹上调稀的釉水和调浓的铁红水也可以,一烧过后表面很像铁胎。”

蓝桉更困惑了,“可是我们外行的要怎么判断铁胎呢?”

宋达很专业地回答“判断铁胎,要根据颜色、质地、声音、密度等因素,比如白皙、细腻、轻薄的胎就显然不是建盏,但铁胎的颜色并不是只有深灰色,有的新盏铁胎因为气氛偏氧化,会偏红褐色;老盏还可能会因为土沁成为红褐、黄褐色。这两种情况,你要是敲开口沿微有毫丝的建盏标本,里面都是深黑色的。

“宋代建盏要烧成斑纹和釉色,胎和釉中的铁必须共同参与,如果胎体含铁量低,就很难烧出精品。现代改良型建盏多是在釉水里面添加一些氧化铁,达到另外一种平衡,也能烧出漂亮的斑纹。建阳水吉当地原料的含铁量都是很高的,所以本地师傅烧的盏,基本上不会有伪铁胎的问题。建盏的斑纹属于铁系结晶釉,需要高温、还原程序。并不是所有的窑变釉都是铁系结晶釉,比如钧窑,就是铜为呈色剂的乳浊釉。

“还有露胎,是建盏的普遍特征,但不是绝对的。宋代建盏也有因为釉水的流动,全包釉的,绝大部分的建盏都会刻意露出一截不施釉的部分,

“现代的技术可以烧出满釉盏,而且满釉盏,要做到不粘窑是非常困难的,必须在的窑炉空间里找到合适的位置,放少数几个建盏,精确控制温度、保温时间、还原剂量和频率、上釉的停止位置、釉的浓稠度,以及在釉桶里停留的时间,影响成品的因素很多,能够烧成那都是珍品。”

蓝桉心生钦佩,才知道建盏的烧制是有这么多学问的。

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