Per 
"The Dividing Bowl" (Alt "The Hungry Bowl", "Polite Patron")
Copper bowl of oriental origin, dated [redacted] (not important, probably over 1,000 years old)
Discovered being used as a dish for loose change.
"Divides" contents of bowl in half when left 'overnight' (see below), sometimes leaves objects in return.
This only occurs with fresh/non-perishable foodstuff (this includes raw meat, fruit and vegetables (but not raw grains); human flesh and blood; marrow but not bone). (Basically, things people would actually eat. For instance, raw pig feet would not qualify but pickled pig feet would.)
Additionally, if edible and non-edible objects are combined
The mass of the foodstuff is always reduced by exactly half (adjusted for evaporation of fluid foodstuffs and so forth).
Some foodstuffs result in 'receiving' small object(s) (usually one or more coins), though this is inconsistent, and no pattern has been established. (Sushi might receive 3 coins one day, and then none ever again, for instance. Or it might result in four the next time, and then two the time after that.)
Bowl must be unobserved in order for this change to take place, and the change always occurs at exactly 00:00 [Redacted] (time zone, not important).
Change will only occur once per foodstuff, and the bowl must be emptied and re-filled with fresh foodstuff for the change to occur again.
That is to say, if the bowl is filled with broth that broth will be divided as normal. However, if left for another period, that broth will not be divided again.
Similarly, 'refreshing' the broth by adding more, fresh broth to the existing broth in the bowl will not result in the change occurring.
Potential 'Danger'
One substance the bowl consistently gives items in return for - human blood. Other types of blood are more successful on average,
When given blood, there is always something given in return, many of these objects consist of or include copper.
When given a mixture of different types of blood, it prefers some over others. In one experiment, it was given a 50/50 mixture of human and pig blood. After the period elapsed and the change occurred, DNA tests confirmed only pig blood remained.
