a high angle - of - attack projectile or bomb comprises separate compartments that , after launch allow for mixing of the chemi - luminescent materials , heating of the materials in the projectile vessel , pressurization of the projectile vessel , and efficient expulsion of a day marker and heated chemi - luminescent mix upon striking the target . the projectile / bomb allows for the marking of targets . the projectile / bomb does not create unexploded ordnance and minimizes use of energetic materials such as reactive chemicals and / or pyrotechnics .