D3scene is not responsible for any outcome from your actions, should you choose to try this at home. Any damage to yourself, others, your property, or others' property is solely your fault. This is for educational purposes only. With that being said..
I have made smoke bombs using this method at least 10 times, and they have all worked flawlessly. Of course, there are a few things I must warn you about, and will refer to again in the instructions.
1. You must CONSTANTLY mix it while heat is being applied, otherwise it will ignite on your stove-top/work surface.
2. It burns very hot, so DO NOT HOLD THE SMOKE BOMB.
3. The smoke bomb emits small, very hot particles, so stand at least 10 feet away.
1. Potassium Nitrate (also known as Saltpeter and KNO3). This is found in fertilizers, but is best in stump remover (high concentration of KNO3)
3. A controlled heat source (stove-top worked best for me, since it has an easily controlled gas flow)
4. Container with a bottom(does not need to be sealed. cylindrical works best)
5. Sharpie marker
6. A few cotton balls
7. Wick (either home-made or the slower-burning green ones found in firecracker packages)
8. Pot or Pan
9. Spoon to stir with
10. Electrical Tape
1. Place sugar and KNO3 in a pan at a ratio of 3 parts KNO3 to 1 part sugar (volume, not mass)
2. Turn the stove/heat source on low
3. Once the heat is on, DO NOT STOP STIRRING THE MIXTURE
4. After several minutes of stirring, the mixture should turn brown and become thicker (it is said to be "carmelized")
5. Once the entire mixture is brown, turn the heat off, and move the pan off of the hot surface (keep stirring)
6. Continue stirring the mixture in the pan for about 2 minutes or so to ensure that the heat from the pan will not prematurely ignite the mixture
7. Remove spoonfulls of the mixture and place it into the container (I used a tube from a push-up ice cream thing)
8. Once the container is filled to the desired amount, push the sharpie marker through the center of the mixture
9. Leave the mixture to sit at room temperature for about 10 minutes
10. Pull the sharpie out and place the wick inside the hole
11. Secure the wick by stuffing the cotton balls next to it (inside the hole)
12. Secure the bottom of the container by wrapping the container with electrical tape, being careful not to tape down the wick
13. Take your finished product out to a spot in your yard or wherever you prefer, light it up, and back off a bit
14. Sit back and watch the fruits of your labor!
I would strongly advise heating the mixture outdoors if it is your first time doing something like this. Just to give you an idea of what could happen if you don't do so, and something goes wrong...
A couple years ago, I showed my girlfriend one of the smokebombs and she said that she wanted to try. I agreed, but told her that she had to stir CONSTANTLY. As I had done so many times before, I set up a small pan on the stovetop, set out pre-measured amounts of KNO3 and sugar, set the heat on low, and told her exactly what to do. I was standing next to her the entire time to make sure nothing went wrong, but something definitely went wrong. My phone vibrated from behind us, and she turned to look at what the unexpected source of noise was. In doing this, she stopped stirring the mixture for maybe 1.5 seconds; that was all that was needed. The pan disappeared behind a giant cloud of smoke and white-hot flames, she ran out of the room while holding a flaming spoon, my parents almost shit their pants, my sister ran outside fearing her life, and I sat in the kitchen laughing my ass off! After about 15-20 seconds of continuous smoke, our entire 2-story house was filled with impenetrable white smoke! You could barely see your hand in front of your face through this stuff. After I opened several windows and went back to the pan, I found out that the flaming particles from the pan burned about 15 little holes in the brand new counter-top and linoleum flooring.
Learn from her mistake. Please do not do this indoors if this is your first time doing this.
If anyone has any questions, feel free to post or shoot me a pm.
Good luck and have fun!
If I get time, I could probably put together some pictures depicting the best time to remove the mixture from the heat. It is pretty easy to dictate, seeing as everything will be thick and brown, but some may still want that extra help.