Active dry yeast

What it is

Active dry yeast is dried into coarser granules than instant yeast and has traditionally needed rehydrating (blooming) in warm water before use to wake it reliably. Many modern active dry yeasts will also work mixed straight in, but blooming remains the safest habit and gives you a live-or-dead check before you commit the batch.

Functionally it leavens focaccia just like instant yeast; the practical differences are the head start and a slightly higher dose.

How to bloom it

Stir the yeast into a portion of the recipe’s water at about 30–35°C (lukewarm, never hot) with an optional pinch of sugar. Wait 5–10 minutes: it should foam and smell bready, confirming it is alive. Then mix that slurry into the dough and proceed. Subtract the blooming water from the recipe’s total so hydration stays on target.

If it does not foam at all, the yeast is dead — start over rather than hoping. Water hotter than about 50°C will kill it on contact, which is a common cause of a dough that never rises.

Measuring and substituting

Use roughly 25% more active dry than instant yeast (so where a recipe calls for 3 g instant, use about 3.75–4 g active dry). To replace fresh yeast, use about 40% of the fresh weight. As always these are small amounts best weighed on a fine scale.

Keep salt off the raw yeast, and do not shock the yeast with cold or hot water — lukewarm is the target.

Storage

Seal it airtight after opening and refrigerate or freeze it, where it lasts many months. Room-temperature storage in a warm kitchen shortens its life. Old, weak yeast leavens slowly and unpredictably; the bloom test is your quick insurance.