Board Thread:Suggestions/@comment-25178962-20140806130856

Small Bomb

This bad-boy's only advantage over gunpowder is a timed explosion, and being a welded brick. That means this guy can be stuck to the back of a lumbermill, activate it safely, and anti-climactically have it loosely tumble into a pile of bricks. It would be a 2x2x1 brick colored like a normal bomb, with the welded surface texture. When activated, unlike a bomb, it doesn't change color (with this added stealth, it could be more dangerous than a usual bomb).

The recipe would be

Plank + Gunpowder + Fuse Chemistry 3, Carpentry 3 