@alliancechemical1: Chemistry Caught on Film, Part 7. In 1969 California pumped 370 gallons of tracer dye into San Francisco Bay, on purpose, to see how the bay would carry a region's waste. The film's narrator said the dye was harmless to fish. Chlorine isn't, so today the plant on that shore neutralizes it with sodium bisulfite before the water reaches the bay. Footage: California Department of Water Resources, public domain, AI-upscaled. Dye test December 1969; film dated 1971 in the archive catalog. The original narrator's line is from the film; the other narration and the music are AI-generated. Plant and dock scenes are illustrations. Not affiliated with or endorsed by DWR or the Army Corps. #sanfrancisco #chemistry #History #archivefootage #sodiumbisulfite

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Saturday 31 October 2026 14:07:58 GMT