can it be used as a wine yeast? we dont know, but it does make awesome sourdough bread... ALASKAN SOURDOUGH STARTER, VERY STRONG, alaskan sour, deal with it, san francisco has nothing on this one. This is our alaskan sourdough starter yeast, dried and pulverized for quick activation. It comes from the Aleutian islands of Alaska, whats that you say, how did we get this one? Well, when you have a son in the u.s. coast guard, and he does 5 tours in Alaska, and he knows we do sourdough, well, all we can say is thank you. This is one for the real sourdough crazies out there, not as sour as the Frontiersman, but definitely better than most s.f sourdoughs, in our opinion. How old is it, he says the woman who shared it with him, says late 1800's, all we know is that it is good. We are making a market here . Over time we will be adding an alaskan sourdough yeast and a San Franciscan sourdough yeast, both of which have a long history and have been cultivated to stay in their original form. We also include recipes for the perfect loaf, pizza dough, bread rolls and lots of help. Have fun with our starters and enjoy Instructions are included to activate our starter, in fact it's so simple here they are: Mix 1/2 cup all purpose flour, 1/2 cup lukewarm pure water, package of starter powder in a plastic bowl Cover bowl and put on the counter On the second day just stir it up. On the third day add an additional 1/2 cup all purpose flour and 1/2 cup of lukewarm water By 48 hours you should see bubbles On the fourth day add 1/2 cup lukewarm water and 1/2 cup all purpose flour Feeding your starter daily for about 5 days will help it reach full activity and flavor. AND now its ready to bake with, use our recipes, use your own, its all good. Our item is vacuum sealed and has an expiration date of 12/30/2035