Response to Ilford Multigrade for film?

My experience has been with Kodak fixers. Generally, the one I use now recommends mixing at half the strength, when used for films, as when used for paper. You might try diluting some of yours 1:1 and trying it on a film leader to see whether the time required to clear is about normal for film, say, 2 to 4 minutes or so. But since it's sold for paper, with apparently no instructions for film, I think I'd limit this to emergency use until you know more.

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