Silk Naturals

How long can Silk Naturals foundations be stored? Do they have an expiry date?

I've had some stored for ages - for most minerals it doesn't make a difference. The technical shelf life for silk powder is about three years, but it doesn't seem to go off - just maybe loses a little bit of the enzymes and such in it. You can still use it after that, but if you want to be sure, then don't keep it longer than three years.