Why is squeezing a ketchup bottle on Shabbos not considered Dosh (Melechet Dash)?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
"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...
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.