What if I need to birth before the jar is fully colonized?
There are many reasons why you shouldn't birth a jar before it is fully colonized.
There are many reasons why you shouldn't birth a jar before it is fully colonized. Non colonized substrate outside of the sterile mason jar environment is very susceptible to contamination from outside, and should be avoided at all costs. Don't birth cakes that aren't fully colonized because the other jars you have are already done. (Remember: "patience".) If you do deem it necessary to pre -birth (there really isn't a very good reason; there are reasons, but more often than not the one you may have is not a good one) it is possible. Birth the cake, and remove the non colonized substrate from the colonized part of the cake with a sterile instrument, like a spoon. Be sure and remove all of the non colonized part, otherwise the colonized part becomes more susceptible to contamination when the non colonized part becomes contaminated.