water pre-soak

Some recommend that film have a water presoak before the film developer. I usually have not done this, but thought Id try it. It makes sense, it allows the developer to contact "wet" film and may give a smoother pour-in without any streaking. So, I tryed it this weekend, and was surprised to see the water pre-soak was green when I dumped it. Any ideas why it would be green?

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