I have gathered some very red clay, it's very red and stains ones hands. I have put some in a glass beaker stirred it daily and added more each day for a week and then waited for the clay to settle to the bottom of the beaker and the water to clear.
Taking a sample of this water and testing it for Iron with a hobbiests test kit results in a zero reading.
Does this red clay in fact contain no iron within it?
Is the iron (if any) not able to be picked up by a hobbiests Iron test kit? (I can dip a hair in Seachems Iron and drop that in the Iron Test water and the reagent immediately turns dark pink).
Is this clay worthless in trying to make DIY clay balls for root feeders as it is (without the addition of added ferts)?
Maybe I should just stick with Seachems Root Tabs, though they work out expensive, I'm getting results from them.