What is the ruling on using metal coinage containing base metals (impure currency or *nuqra*) as capital in partnership?
General Chapter
Al-Mughni
Book of Partnership
Primary text
The ruling concerning impure metal coinage (*nuqra*) is the same as the ruling for non-monetary goods ('urud) because its value fluctuates (increases or decreases), thus resembling 'urud. The same ruling applies to mixed currency where the impurity (ghish) is present, whether little or much.
Supporting text
Abu Hanifa ruled that if the impurity is less than half, the currency is valid, based on the principle that the prevailing element is considered in many fundamental matters. However, the correct view is that since it is adulterated, it should be treated as heavily adulterated, resembling goods whose value fluctuates. The exception is if the impurity is extremely minimal for the purpose of minting, such as a slight amount of silver in a dinar that cannot be avoided and does not affect the ruling on usury or other matters.