The Orange Bloon is a bloon that is immune to bombs and fire, like black bloon, but it has the Solidify Ability. The Solidify Ability is activated when the Orange Bloon is being hit by fire or bombs.
The Solidify Ability means, that if the Orange Bloon is being hit by bombs or fire, it becomes a special Ceramic Bloon that has the same properties like the normal Ceramic, but contains one Orange Bloon. That makes popping this very difficult.
The Orange layer itself can be destroyed bit a single hit, except for heat-related things. It contains 2 blacks, and has a speed of a yellow.