وَإِذَا كَانَ الْغَالِبُ عَلَى الدَّرَاهِمِ الْفِضَّةُ فَهِيَ فِضَّةٌ
Translation: If silver predominates in the dirhams, they are treated as silver.
A small admixture of base metal does not remove a predominantly silver coin from silver's legal category. Its exchange with similar coins or pure silver remains subject to the rules of same-metal equality.
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Coins predominantly made of silver
Bab al-Sarf: Mixed Currency Exchanges, Debased Coins and Obsolescence
وَإِذَا كَانَ الْغَالِبُ عَلَى الدَّرَاهِمِ الْفِضَّةُ فَهِيَ فِضَّةٌ
Translation: If silver predominates in the dirhams, they are treated as silver.
A small admixture of base metal does not remove a predominantly silver coin from silver's legal category. Its exchange with similar coins or pure silver remains subject to the rules of same-metal equality.