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Iron is tricky stuff. It is terrifically reactive and the ferric (Fe+3)
ion is almost insoluble. I have no idea how the test kits work but a
reputable test would remove chelated iron from the 'chelos' (from the
greek word for claw) in order for it to produce a color. Of course most
labs analyze with some kind of flame so chelation is not an issue.
Personally, I wouldnt trust any iron test kit. I like Karens approach...
look to your plants!