INSTANT DRY YEAST (IDY)

 A very finely-divided strain of dry yeast that, because of its particular strain and its smaller particle size than active dry yeast (ADY), needs no re-hydration, or "proofing", in water or other liquid to activate it and can thus be added directly to the flour and other dry ingredients. Moreover, instant dry yeast contains more live cells than active dry yeast, further facilitating its activation. Once in the flour, the instant dry yeast can tolerate liquid temperatures of 120–130̊F Because of all these factors, the instant dry yeast will start to work faster than active dry yeast. Like active dry yeast, advantages of instant dry yeast include convenience of use and long storage life, especially when sealed and frozen in an airtight container.

The information for IDY was copied from The Pizza Glossary at: pizzamaking.com

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