Crack Balls

Crack Balls

It’s fireworks time! has a recipe for a more powerful version of those balls that bang when you knock them together. You paint smooth rocks with a mixture that contains powdered glass, potassium chlorate, and sulfur (all disclaimers in place). Then let dry. Drop or throw the rocks, and they’ll “bounce” repeatedly with a loud explosion each time.
(scroll down to middle of page).

0 thoughts on “Crack Balls

  1. says:

    You know, one of the really compelling reasons for getting a house and yard would be to be able to do projects like this.

  2. onyxfrog says:

    wow, I never thought it would be make magazine telling me how to make crack rocks.

  3. Ironious says:

    I tried this and they work. Th rounder the rock, the better. Also throw it hard onto the ground. The arder, the better.


Paul Spinrad is a broad-spectrum enthusiast, writer, maker, and dad who lives in San Francisco. He hatches schemes at

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