Subject: What does the different colors of rust mean, chemically.

I did a science experiment to test if bacteria filled water would cause 
increased rusting of iron.  In the course of my experiment, I observed that the 
sterile and control iron APPEARED to have more rust, and that it was a gold 
color.  The bacteria iron APPEARED to have less, but it was reddish.  At the 
end of my experiment, I weighed the rust samples, and found that the red rust 
weighed more, even though there appeared to be less of it.  So I wonder if the 
redder rust means that more of the iron was oxidized?  Thanks

Re: What does the different colors of rust mean, chemically.