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Can I REUSE an alginate bath for reverse spherification? If I use a solution of alginate today, can I use the same solution next week? How should it be optimally stored? How long will it keep. How many "spheres" can be produced by a batch of alginate?

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I voted up your question solely based on the fact that you said, "reverse spherification". Kudos. –  mrwienerdog Jan 27 '12 at 20:06
I have no hard data to back this up, so I'm making it a comment not an answer. My sense is that it should be good for at least 3-4 days in the refrigerator, like most perishable foods. –  Michael at Herbivoracious Feb 7 '12 at 22:47
Oh, and another note - you might like the ideasinfood gellan method better than alginate. blog.ideasinfood.com/ideas_in_food/2012/03/… –  Michael at Herbivoracious Mar 28 '12 at 18:14

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This site say you can use it again, just make sure you strain it before you store it http://www.molecularmixology.co.uk/index.php?act=viewRecipe&recipeId=34

This site says you can store it for a couple of days in the fridge http://www.molecularrecipes.com/spherification/7-tips-making-spherification-caviar/

As for how many spheres can be produced - I'm afraid that would be completely dependent on how large you make your spheres.

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