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Re: iron

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!