Great demonstration of the process, Andrew! Adequately detailed and immensely useful. It is certainly something I wish I had available to me when I got started. Thanks.
The inventor of the process @Raghu Kuvempunagar would be able to answer this better than me...but even if you could do it, why would you want a ferroblend negative?
No, at least as far as I can see. For FerroBlend, Ferricyanide needs to be present in the sensitiser which invariably slows down the exposure. Even Cyanotype isn't really useful for in-camera application unless one keeps Ferricyanide out from the sensitiser (as done in Cyano-Rex type processes).
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