Zinc oxide is the metal zinc that has been oxidized. The chemical formula is ZnO, 1 zinc atom and 1 oxygen atom held together by an ionic bond. Zinc oxide does occur in nature as the mineral zincite, but it is quite rare and commercially unavailable.
I have done a few stool samples in my time and have always just stored them in the fridge, until the next day to take them into the docs. Good luck hun I hope they get it sorted.
Discard any leftover brine. Place the lids on the jars (or containers) and refrigerate for at least 24 hours before serving. (Refrigerate okra and turnips for at least 1 week before serving.) Pickles will keep in the refrigerator for up to 1 month.