Step 1: Stuff you need.
Potassium nitrate (can be made explain later)
Potassium clorate (can be made explain later)
Powdered coal ( Can be made by crushing coal)
sorry no pic for this step.
Step 2: Making the liquid
Potassium Chlorate 33 parts, Potassium Nitrate 33 parts, Sugar 24 parts, Powdered Coal 10 parts.
Make sure the coal is fine enough to go though a seive. mix it all together in a glass or beaker or a container. slowly add water until you have a thick liquid.
Step 3: Coat the string.
Step 4: Make the stuff! (optional).
(fertilizer) to make nitric acid and add anything with potassium in it.
to make potassium clorate go to rotteneggs.com it is to long to write.
Step 5: WARNINGS!
If you don't put enough water in the compund will turn into a stiff putty and dry. If that happens it is supposed to explode. I am not responsible for any injurys/deaths caused by misuse not following instructions or anything else.
I got this from a different site but their instuctions say how to make an explosive not a fuse. I don't know weather it will explode if it drys or not.