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I'm missing some context here: Why do we want to extract strontium nitrate anyway?

The author's home page reveals that he has an interest in amateur rocketry. Strontium nitrate doesn't sound suitable as a propellant, so I suppose he wants it to generate visual effects.

https://spiegl.org/unsorted/unsorted.html

Red rocket engine flame looks really neat.

Because we don’t have a Sigma Aldrich account.

And more importantly we don't want to pay.. $360 a kilo for reagent grade. Yikes.

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