making cultured buttermilk

[Guest guest]

I'm very new to this and wondered if someone can tell me if I use part of my cultured raw buttermilk and mix it with my raw milk, will I be able to make more cultured milk which will thicken if I leave it on the counter? Do I mix 1 part of the cultured buttermilk to 4 parts of the milk? How long does it normally take for it to thicken up?

Thanks for any advice you can give,

Sharon Vote for your city's best dining and nightlife. City's Best 2008.