@ Boofer, from what I gathered it's not a hugely concerning issue, just a visual thing. I believe it's not to do with linens as I have been able to remove that well. It's still quite feasibly a different mold with a tougher stain, but I have nothing conclusive either way.
@Tomer, how did the brandy do for you flavor wise? Could you taste it in the final product? Did you like it?