Glass Etching Question

[djnurseallison.livejournal.com]

Sooo I'm etching glass for the first time! My question is, can I scrape used Armour Etch back into the jar to reuse later? In other words, can the liquid's caustic properties get "used up?" Perhaps I'm being cheap, but that little bottle was pretty expensive. Any help would be appreciated.

And so this isn't just text, behind the cut are some pix of a Meatwad keychain I made for my brother :D