I believe sorbate has the shortest shelf life. It gets weak after a year or so. I think most of the rest of the chems. I use usually last til they are used. The one chem. in acid test kits has about a year life also. Can't think offhand what it is. Any bulk chems. I have purchased, I store in the refrigerator. Most of the others that come in small bottles I have on a shelf over my wine bench. Arne.
