Drops of aqua regia at different concentrations react with gold plated contacts on a printed circuit board. From left: 10 K, 14K, 18K, 22K solutions o

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Drops of aqua regia at different concentrations react with gold plated contacts on a printed circuit board. From left: 10 K, 14K, 18K, 22K solutions of test kit acid show the contacts are between 10k and 14K.

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Size: 9000px × 6150px
Photo credit: © Peter Righteous / Alamy / Afripics
License: Royalty Free
Model Released: No

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