Crush up some match heads into a fine powder on a sticky note. Then scrape some of the red phosphorous on the side of the box onto a separate pile on the sticky note or a separate sticky note. Make sure both powders are fine. You want 3 part match head and 1 part red phosphorous. Mix them together in a cup and poor it into your caps or onto a brick or whatever and hit it with a hard impact. !WARNING! IT IS SUPER LOUD!!! WEAR EARPLUGS OR SOMETHING!! I MADE A LARGE PILE AND SET IT OFF SUPER CLOSE TO MY HEAD; IT WAS SO LOUD THAT MY EARS RANG FOR 2 DAYS STRAIGHT AND I PROBABLY PERMANENTLY DAMAGED MY HEARING!!!!