اِحْمَرَّ — اِحْمِرَارًا
Becoming red; its verbal noun follows the ifʿilāl pattern.
اِدْهَامَّ — اِدْهِيمَامًا
Becoming very dark green or nearly black; its verbal noun follows the ifʿīlāl pattern.
A doubled final radical alone is insufficient to classify a verb. The full template and the lengthening in the verbal noun distinguish these two.
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Distinguishing ifʿilāl and ifʿīlāl
Nine Augmented Triliteral Patterns with Hamzat al-Wasl
اِحْمَرَّ — اِحْمِرَارًا
Becoming red; its verbal noun follows the ifʿilāl pattern.
اِدْهَامَّ — اِدْهِيمَامًا
Becoming very dark green or nearly black; its verbal noun follows the ifʿīlāl pattern.
A doubled final radical alone is insufficient to classify a verb. The full template and the lengthening in the verbal noun distinguish these two.