وَيَجُوزُ بَيْعُ دِرْهَمَيْنِ صَحِيحَيْنِ وَدِرْهَمِ غَلَّةٍ بِدِرْهَمٍ صَحِيحٍ وَدِرْهَمَيْنِ غَلَّةٍ
Translation: It is permissible to exchange two sound dirhams and one ghallah dirham for one sound dirham and two ghallah dirhams.
Ghallah is explained in Fath al-Qadir as clipped or broken dirhams rejected by the treasury but accepted by merchants. It should not simply be equated with coins whose predominant substance is base-metal adulteration.
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Sound and ghallah dirhams
Bab al-Sarf: Mixed Currency Exchanges, Debased Coins and Obsolescence
وَيَجُوزُ بَيْعُ دِرْهَمَيْنِ صَحِيحَيْنِ وَدِرْهَمِ غَلَّةٍ بِدِرْهَمٍ صَحِيحٍ وَدِرْهَمَيْنِ غَلَّةٍ
Translation: It is permissible to exchange two sound dirhams and one ghallah dirham for one sound dirham and two ghallah dirhams.
Ghallah is explained in Fath al-Qadir as clipped or broken dirhams rejected by the treasury but accepted by merchants. It should not simply be equated with coins whose predominant substance is base-metal adulteration.