Found one that is yellow in color.
http://www.lincolncentsonline.com/error3.html""Brass Plated Cents
It is not uncommon to find a Zinc cent that has been Brass plated instead of plated with Copper. This can happen when Zinc planchets get left behind in the plating tank and dissolve to combine with the Copper which becomes Brass. Then this solution gets plated onto the next round of Zinc planchets.
Brass plated cents will have more of a yellow color to them verses the normal red color of the Copper plated cents.""



