I meant to say the original mortar is brown. The brown caulks I've seen are not for use on masonry. The masonry caulks are white or gray. That's the problem.
The chimney on my roof has some cracked bricks. The chimney cap, crown, and flashing are fine. In the past I used silicone masonry caulk to seal cracks as advised by a mason, but the caulk is...