It's far too "young" to use. The yeast/bacteria in the mix
produce substances which kill the nasty toxic/pathogenic bacteria
present. How long it takes varies, but I would not risk less than a
week. I usually wait until it's really frothing, put it in the fridge
until it forms a clear layer of hooch. If the hooch smells fruity ,
it's fine. Start with that.
I still don't understand why people make so much starter. I
take out my fridge starter, add a teaspoonful of that to two
tablespoons of flour, add water to a toothpaste consistency, and wait
for it to rise. When it's bubbly, I put it back in the fridge.
The rest I use to make my bread (starter+1/2 cup of flour +
1/2 cup of water, the night before the bread making.)
No waste.
[]'s
PS never mix commercial yeast with sourdough, they hate each other.
My starter "from scratch" is now 10 years old, still making great
bread.
--
Don't be evil - Google 2004
We have a new policy - Google 2012