The original root letters of اِحْمَرَّ are ح، م، ر.
This Bab has two visible structural features:
1. Hamzat-ul-Wasl at the beginning.
2. The final root letter is doubled and written with Shaddah.
So the final ر appears as رّ.
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Root and Structural Signature
Derived Trilateral (with Hamzah) - Bab 4: If'ilaal (Ihmirar)
The original root letters of اِحْمَرَّ are ح، م، ر.
This Bab has two visible structural features:
1. Hamzat-ul-Wasl at the beginning.
2. The final root letter is doubled and written with Shaddah.
So the final ر appears as رّ.