Our sauces all have a ph well below 4.0, and are tested on a per batch basis.  The flavor actually improves greatly as the sauce matures, so when we find an older bottle we are always excited!  Sauces can of course fade in color and settle, but this does not affect flavor or food safety.  Just give it a shake and you're good to go!Of course food safety is paramount, and we have always featured batch traceability with our batch codes that are unique to every production run.  We can trace the day, month, and specific cooker batch of each and every bottle.