This is a reasonably safe, easy to make, high powered flash powder, suitable for use in electrically triggered pyrotechnics effects.It stays reasonably stable under various moisture conditions.For instructions ...
"Fluff" your aluminum powder by agitating it with a spoon or similar instrument. This serves the same purpose of the milling did with the perchlorate: The powder will not be clumped together, and it will mix better, making a more reliable explosive.
Again, using your scale, measure 1/3 of your batch size in aluminum powder.
Carefully pour the aluminum powder into the mixing bag with the perchlorate.