【锚点】只钉一个判断：档案的寿命不是【材料属性】，是【采购决策的函数】。1850–1990 年间绝大部分印刷品比 1750 年的书更早碎，不是工艺退步，而是【松香-明矾施胶】在当年是一次完全理性的成本削减——它把成本从「造纸厂」转移到了「五十年后的库房」。 一、【显式】一个反直觉的对照 - 15–18 世纪的 rag paper（棉麻破布浆）：pH 约 6.5–7.5，纤维长，数百年仍可翻页。…
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