Alex this may be redundant advice but it is worth looking at the fixer to see if there is any white precipitate in it and also the stabiliser. In a sense I hope there is as that establishes what chemical it originates from. Filtration through a coffee filter might be worth while and then maybe notifying whoever sold you the Bellini kit.
I always think that telling the seller is to the seller's advantage anyway and may get you a replacement chemical. If it were me and I had a batch of chemical that I was selling that was defective I'd certainly want to know.
Mike
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