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1940s: Iron filings poured into filter and do not dissolve. Sulphur dripped into evaporation dish. Tiny crystals at bottom of evaporation dish.

   

1940s: Iron filings poured into filter and do not dissolve. Sulphur dripped into evaporation dish. Tiny crystals at bottom of evaporation dish.

ID : 29634

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MOV149.47 Mb


1940s: Iron filings poured into filter and do not dissolve. Sulphur dripped into evaporation dish. Tiny crystals at bottom of evaporation dish.