Originally Posted by Danek
Looks good! As a non-microbiologist, what's the advantage of using agar rather than normal wort?
Let say I go out and collect a sample of yeast and its possible get some mold too along with the yeast.
If I have the agar sample I can watch surface growth right on the agar. The agar specimen is a hard DME jelly. DME boiled with agar.
Look at this picture. The white streaks are yeast and other gray/green stuff is mold.
I can use a sterile loop (SS wire heated via flame) to lift off some yeast to place into a 25 or 50ml starter. Then start stepping it up to a larger size.
If I used a jar of wort I could get both mold & yeast. The fermented sample might be infected or plain nasty. Its possible that I could be just fine as well. The difference is that with AGAR I can select what I want to put in a starter. Mainly to avoid mold and have more control.