Turn off ignoreCollision

hi.

i use the command Physics.IgnoreCollision in my script. an object is turned to ignore the collision at a specific time. but i want the collision to turn on again after a few secounds. what would the command be for not ignoring the collision anymore?

thank you!

The command to turn it off (a.k.a. turn the collision on again) is

Physics.IgnoreCollision(obj1, obj2, false);

it worked. thanx!!