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Why is squeezing a ketchup bottle on Shabbos not considered Dosh (Melechet Dash)?

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"Dosh (threshing) is the fifth of the 11 agricultural melachos. It involves removing something edible from its natural casing." OU.org. I would hardly say that the ketchup bottle is its natural casing...

And in case you meant S'chitah: "S’chitah involves squeezing or wringing something out in order to extract a liquid" - which you're not doing here...

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Beat me to it, thanks! –  Shalom Feb 16 '11 at 0:31
    
WOW! By 3 seconds. That might be a record. –  yydl Feb 16 '11 at 0:31
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The prohibited labor category of "threshing" applies only to removing agricultural items from their natural container (such as threshing wheat, or squeezing juice from grapes); or wringing out absorbed liquid from something porous (such as a cotton cloth). The plastic container is not the "natural" container, and the ketchup is not currently absorbed in the bottle.

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In fact, the halachic status Kli/utensil may itself nullify any considerations of Schita, despite its being porous or absorbent. See Sh"A O"C (320:17) re: sponge with a handle. –  Barry Feb 16 '11 at 17:46
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