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TEST TUBE SAMPLING: PENNIES IN HYDROCHLORIC ACID <br /> (Variations Available)<br /> 10 Pennies In 10 Test Tubes of HCl.<br /> All pennies are scratched. Six react, releasing H2 gas bubbles. Minted after 1984, the reactive pennies are 97.5% zinc. Four pennies were minted prior to 1982 and are copper alloyed with only 5% zinc.

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TEST TUBE SAMPLING: PENNIES IN HYDROCHLORIC ACID
(Variations Available)
10 Pennies In 10 Test Tubes of HCl.
All pennies are scratched. Six react, releasing H2 gas bubbles. Minted after 1984, the reactive pennies are 97.5% zinc. Four pennies were minted prior to 1982 and are copper alloyed with only 5% zinc.

Copyright:© 2005 Richard Megna - Fundamental Photographs

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