It's simple, it's effective, it's waterproof.
This Instructable is for people who are playing with chemicals and making their own pyrotechnic devices.
The short video shows the fuse burning and nothing more.
The long video show exactly the same clip and three others with titles.
Step 1: Materials
Inorganic oxidising agent*
Polyethylene (HDPE) milk bottle (or similar)
A knife or scissors
A mortar & pestle
*If you're making fireworks you'll have some, e.g. KNO3.
Back then I could get sodium-chlorate weed-killer (it's broad-spectrum) where ~50% was just salt. You put it through a sive and the big-lumps are what you want.
Last time I bougts some the salt was caked onto the lumps like Nerds etc,,