Philip Thorrold is an extreme shotgun shooter. He shot clays from his Ferrari while a driver did doughuts.

In this video, he has three clay launchers aimed at himself and he has to shoot the clays before they hit him.

It looks like the clays are coated in something. You can see a small cloud puff when they are launched and then when he hits the clay a large black cloud is formed. I think this is so we can see and confirm he hit the clay on video. Anyone know what he used to get this effect?