Thanks for the quick response on that, and for the welcome! Greatly appreciated. I did consider it may not have all mixed however it was a liquid concentrate (selenium from powder is dicing with death I've heard).
I do filter my toner regularly to remove the dark particulates but this seems a very different substance.. I'll filter it though and see if that gets somewhere. The hypo is also something I hadn't considered, I'll mix some up and give that a shot as well!
And the water is definitely very hard here so again that could be possible, but I would have thought I'd have suffered that problem previously. It's a strange one, but thanks for all the suggestions.
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