chemical reactions imply heat or other evidence of activity such as gas. punch a tiny hole in a can of peaches and leave it on the shelf for awhile ... that's a chemical reaction.

On Fri, 23 Mar 2007 06:10:58 GMT, Don S wrote:

>That is the copyright date for the label, if it has a sell by date then
>you know it goes bad over time. Generally speaking, it the container
>looks in good shape and is not discolored then most chemical / petroleum
>products should be good.