Manual mulling is carried out for not more than: (A) 1-2 seconds, (B) 2-4 seconds, (C) 1-4 seconds, (D) 2-5 seconds
Answer is D. In mulling, the mixture is enveloped in a dry piece of rubber dam and vigorously rubbed between the first finger and thumb. This process should not exceed 2-5 seconds.
Reference: Marzouk Operative dentistry, pg-113