第254章 挖到了陶土!!

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中的石铲上下翻飞。
    随着他的挖掘,树根下的土层剖面清晰地展现在镜头前。
    最表层,是黑色的、混杂着烂树叶和植物根系的腐殖土,松软肥沃。
    王昊直接将这层土铲掉,弃之不用。
    往下挖了大概三十厘米,土层颜色变成了黄褐色。
    这层土质地稍微紧实了一些,但依然不够纯净。
    王昊捏了一把,摇了摇头,继续向下深挖。
    终于。
    当铲子深入到树根最深处的缝隙时。
    一抹鲜艳浓郁的红色映入眼帘。
    那是一大块紧紧卡在树根深处的红黏土。
    它不像表层土那么松散,也不像中层土那么干涩,而是呈现出一种细腻、油润的光泽。
    在阳光下,它像是一大块凝固的红色油脂,又像是一块新鲜的猪肝,质地极其致密。
    王昊伸手挖出一块,在手里揉捏了几下。
    那种细腻、粘糯的手感,让他满意地点了点头。
    “果然,树根底下出好土。”
    “这成色,绝了。”
    演播大厅内,刚补完课的吕易立马抓住了机会,开始现学现卖。
    “大家看!这就是最好的陶土!”
    “这在学术上叫淀积层红黏土。”
    “表层的黑土是腐殖质,中层的黄土是淋溶层,虽然也能用,但杂质多,粘性差。”
    “而这深层的红土,经过上万年雨水的淋滤,氧化铁含量极高,所以呈现出这种鲜艳的红色。”
    “它的优点非常明显,含铁量高,烧出来颜色漂亮,颗粒极细,可塑性极强,能捏出非常复杂的造型而不裂。”
    吕易顿了顿,继续科普道。
    “当然,它也有缺点,就是收缩率大,如果处理不好容易变形。”
    “不过看王昊选手这挑选的眼光,专门找这种大树根底下的土。”
    “树根强大的吸水力和挤压力,其实已经帮他完成了一部分天然的筛选和陈腐工作,这里的红土,含沙量适中,品质绝对是顶级的。”
    说到最后,吕易推了推眼镜,脸上露出一丝得意的神色。
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