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Dropper Bottle for Vinegar (or other dilute acid) $0.35
A drop of acid will tell you and your students whether the rock they have found is made of limestone (calcium carbonate), because it will  fizz.  These small dropper bottles are the safest we've found.  They quite predictably deliver one drop; the top seals tightly and they hold 15 ml which lasts quite a while.  You can fill them with your choice of dilute acid.  Exercise caution when handling any acidic liquid.
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Ruth Deike
Rock Detective Geoscience Education
395 Deer Run Drive
Nellysford , VA 96080

Phone: 434-263-3737

EMAIL:

 

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