<prompt> Tattooing in entry wound of a firearm injury is due to:BurnsSmokeGunpowderWads  <response>: Effects of different discharges from a gun: Fire Flame -- burning at entrance wound along with burning or singeing of hairs. Smoke - Blackening effect or smudging Hot gases- Scorching effect Unburnt Gun powder - Tattooing effect, peppering or stippling effect Felt wad - Minor abrasion and bruise. Bullet Pellet - Puncture wound with abrasion collar. 