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Source for WW2 era "KRONAK" plating solution

I need the formula for the plating solution that was used during the WW2 era (and probably later) to add corrosion resistance to steel cartridge cases. The solution was called Kronak during the time frame. I think it was also used to coat automotive fasteners. This material gives a light green color to the steel cartridge cases that I have seen. It must have been a solution that was close to zinc dichromate.
TIA,

Everett Noe
hobbyist - Knoxville, Tennessee, USA
February 28, 2011

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