I have had contamination that looks like this, and I've lost all the cakes that were contaminated !
It kind of ends up like blue vein cheese, just wait and watch... better to see what it is upto, isolating the jar is a good idea, to prevent further contamination !
Just my two bits,
Peace------------------
Maverick shroomed@rediffmail.com
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Psychedelia in India....
We arent there yet but ,
We are getting there !!!