Blue glass jar has painted gold label that reads, “FERRI FERROCY” which is Ferric Ferricyanide, otherwise known as “Prussian blue” or “midnight blue”. It was the first modern synthetic pigment. The blue pigment was used in paints, dyes and laundry bluing. In medicine, Prussian blue is used as an antidote for certain kinds of heavy metal poisoning.

Jar measures 5 ½” tall x 5” in circumference. No cracks and two small chips on edge of jar. Some of the gold label has worn but it is totally legible.  [sm]

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