I bought a few of these old jars that have these cool handwritten labels.
I was told these were from the OHSU Pharmacy up on the hill and when the pharmacy relocated to the waterfront, these were not needed.
When I googled what was in this bottle, I learned this: Tartaric acid is a naturally occurring organic acid, commonly found in fruits like grapes, bananas, and tamarinds.
The ground stopper on this is in good condition and it lifts from the jar easily.