If the item is a nuqrah—an unworked silver ingot—and a third party establishes title to a part, the buyer takes the remainder for its proportional price without the same option to reject that arises with the vessel.
The reason is divisibility: the ingot can be apportioned without the kind of functional impairment involved in jointly owning a finished vessel. The distinction turns on whether partition diminishes the nature of the item.
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A third-party claim to part of an ingot
Bab al-Sarf: Precious-Metal Exchange, Possession and Composite Goods
If the item is a nuqrah—an unworked silver ingot—and a third party establishes title to a part, the buyer takes the remainder for its proportional price without the same option to reject that arises with the vessel.
The reason is divisibility: the ingot can be apportioned without the kind of functional impairment involved in jointly owning a finished vessel. The distinction turns on whether partition diminishes the nature of the item.