帝当年刻下的警示,"朕的江山," 指甲划过书页间夹着的铁矿税单,"不容任何人用黑驼山的私矿铁水、鲁王府的澄浆泥釉、赵王坊的密纹绢帛," 目光如刀扫过三王,"来丈量深浅。"
验功房内烛火如豆,谢渊的银镊子在符灰中精准翻动,八面体结晶的黑色微粒在烛芯爆响中闪烁。他腕间的獬豸纹银镯擦过《工部矿脉图谱》泛黄的书页,霉味混着金属气息在狭小空间里流转:"周立," 镊子突然顿在瓷盘边缘,"取黑驼山矿脉第三层样本 —— 带神武年间的官办筛网。"
周立双手捧出紫木匣,匣盖开启时带出细微的矿砂摩擦声:"大人,这是去年查封秦王私庄时..."
"含砷量超标三成。" 谢渊的镊子夹起微粒对准烛火,晶型在光晕中投射出清晰的八面棱角,"神武五年工部批文," 他的指尖划过图谱上的朱砂批注,"因砷化物易致甲胄脆裂遭禁," 又指向铜炉方向,"但齐王符节的青铜层里," 镊子轻叩瓷盘,"却嵌着这种毒砂。" 他忽然抬头,眼中映着跳动的烛火,"与兵器车护心镜的锻铁," 声音冷如霜刃,"同出黑驼山北麓矿坑。"
釉面碎屑在白瓷盘中泛着灰青光泽,谢渊的放大镜缓缓下压,镜片与瓷盘的距离精确到半寸:"看这里," 他的指尖划过碎屑表面,"不规则收缩气泡," 镜光聚焦在气泡群中心,"直径零点三分," 又取出宗人府拓片,"与鲁王府三年前烧制的澄浆泥碗," 指腹碾过拓片凹痕,"收缩率偏差千分之五 ——" 镜光突然扫向鲁王所在的金銮殿方向,"官窑匠人绝不会犯的错。"
最致命的发现来自墨粒。谢渊的银针穿透未燃尽的朱砂块,在火折子上悬停时,妖异的红光中竟泛着极细的金斑:"秦王去年冬至贺表," 他对照《司礼监用墨笺》中褪色的朱批,"因掺入赤焰矿粉过量," 针尖轻点墨粒,"朱砂晶体呈六棱柱状," 又望向秦王方向,"而符节铭文的墨痕里," 银针在火上划出弧线,"同样的晶体结构正在融化。"
宗人府密档的符节拓片铺在楠木案上,谢渊的拇指沿着绢底纹路滑动,指腹传来细密的滞涩感:"七经三纬," 他突然抽出《尚宝司织作则例》,翻到用红笔圈注的页脚,"这种织法," 指尖敲打着 "诸王私密" 的朱批,"需要七十二道穿综工序," 又取出赵王私产工坊的织机图,"全吴只有三处工坊能织," 声音陡然低沉,"而其中两处," 目光扫过密档附页,"早已登记在齐王名下。"
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