I need Iron powder. What's the best way to produce it?

I have Ferric Chloride and Aluminum...


I also have steel filings from grinding steel objects, though some Iron Oxide have be separated (I do have Oxalic Acid and Citric Acid). Though that would give me steel powder, not iron.


Which is the most economical and would yield purest samples?




Sigma-Aldrich has a [product](http://www.sigmaaldrich.com/catalog/product/aldrich/267953?lang=en&region=US) that is very pure but rather expensive. I suspect you can have high purity or low cost but not both.


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You could use a high grade metal file on some clean cast iron or an iron nail and coldest the metal shavings which is similar consistency to a powder. An iron nail would be galvanized though so you'd have to take the coating off first. Impurities may be present from the file though.


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