I have some SAF Instant yeast that has been around awhile. Is there a good way to "test" it before I waste a whole lot of time and ingredients just to find out that the yeast had had it? Do I proof it to see if it's still active? A long time ago I used cake yeast and you can tell by looking when it's beyond the pale. Regular (active) yeast shows its value every time I proof it. Now, what about instant yeast? Any time you are uncertain about your instant yeast you may check it by proofing it the same way you would proof your active dry yeast. Joan D@bakershotline

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