Using old dye solutions

When I dyed the last lot of fibre I used up some old dye solution, which had been sat in its squirty bottle for a couple of weeks.  I was just curious to see if it made any difference. 

It worked fine, but it did look as if the dye had crystalised a little in places, as I got a few green granules appearing here and there – they are just about visible in this picture.  They aren’t apparent in the finished fibre, but I guess there’s a limit to how long the dye would stay useable?

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