This is beautiful fabric. I believe the black spots are mold, though. I'd take the fabric to a reputable cleaners and get their take on it. Once I purchased a brand new all silk dress to wear to a family wedding. During the party, the dress literally shredded up the side seams leaving me quite exposed. Turns out, the fabric was found to be old and I was fully refunded. (I ended up wearing my husbands suit jacket for the remainder of the night) Silks can be funny....