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... yes allow them to see things in dark places, but humans are not. So for lighting in the cave, the cheese took a small piece of stone from one small bag and some white powder from another bag, spread the powder on the stone and rubbed it for a while. Soon, the humble stone began to emit a stable white light, the brightness of which could be comparable to torches.
"Grey phosphorite plus powder on the wings of the white feather butterfly will glow under a slight heating environment." The mag ...
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