HELP re milk fed starter
A friend gave me milk fed starter her aunt originally started about 1973, used mostly for biscuits (friend's are wonderful)
Last night I fed 1 c. starter: 1/2 c, sugar:1 c. 2% milk as usual. Several hours later I wanted a cup of warm milk before bed, but when I heated it, there appeared to be soft clumps, which, on research, I decided must be clabber (new term to me) I discarded the milk.
Today I used a small amount of starter (made 2 biscuits). They rose ok after about 30 minutes rise, and had just a faint hint of sour flavour when baked.
My questions: - is it safe to use the starter? If not, is it safe to keep a small amount and hope new feedings will save it? or should I discard it?
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On a slightly different note, do the biscuits need to raise before baking? (recipe includes b.powder and b.soda also). I have ingredients for recipe, but not instructions. I have baked many biscuits, but not sourdough ones.
I'm new to sourdough, so any help will be really appreciated.