Last Updated:2025/12/04

The historian's research uncovered letters written with sympathetic inks that only revealed their messages when exposed to heat.

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The historian's research uncovered letters written with sympathetic inks that only revealed their messages when exposed to heat.

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その歴史家の研究は、熱にさらされると初めて内容が現れる見えないインクで書かれた手紙を発見した。

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