Chinese codex(2000 edition)said that processing of ruddle is to calcine it thoroghly and quench with vinegar and grind it into meal.
《中国药典》2000年版,对代赭石的炮要用“煅至红透,,成粗粉的方法”。
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In those first digs, archeologists had found some stone tools and pieces of natural pigment called ochre that they thought were 50 to 60,000 years old, which suggested that humans might have shown up in Australia around then.
在最初的挖掘中,考古学家发现了一些石器和称为赭石的天然色素碎片, 他们认为些东西有 50 到 6 万年的历史, 表明人类可能大约在那个时候出现在澳大利亚。