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It's a little hard to tell from the pics. . .did the contamination start from inoculation points? It's likely the inoculant is to blame, unfortunately there's no way to give it a name other than 'bacteria'. Was the karo knocked up with spores? If so, you might want to keep some of the spores aside next time to inoculate; Maybe 8 jars with the same karo method, 3 with straight spores, and one not inoculated at all to show the jars are sterile.