Somewhere on Jack's site he has a fairly extensive discussion of chemicals
and how quickly they degrade.

Ray

"Julie" > wrote in message
om...
> Hi all. I've had my stuff stored for almost a year now, and havent'
> had the opportunity to make wine in that time (shocking, I know). As
> I unpacked my wine making goodies, the pink cleansing solution looks
> pretty washed out, which got me to wondering...
>
> what would the shelf life of the various chemicals be, like potassium
> sorbate, yeast nutrient, sodium metabisulphite, pectic enzyme,
> bentonite and acid testing kit?
>
> Thanks!
>
> Julie