FORM 9: It is derived from the FORM 1 by adding a prefix "Hamzat al-wasl" and also by doubling the third root letter. For example, the red is aHmaru. By doubling the third root letter, it becomes "aHmarra" and by adding "Hamzat al-wasl" it becomes "iHmarra." It is usually used for expressing colors. iHmarra = to be red or to become red. The exemplary verb if'Alla is used for conjugation.
Courtesy of:
(PrayerWare)