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The insides are stainless steel... These are not ceramic monoliths.

The body is SS. That is the issue... Thanks for the info. I'll update the thread as things progress.

KCN sounds very difficult to handle...

So, are you saying we could pass current through a solution and we place the stainless in the solution it won't dissolve? That's pretty cool. So... if we used the mixture of acids that dissolve platinum and put current through the solution would the stainless stay solid?

Well, the plan is to use 10% or so sulfuric in an outdoor tank. The tank has a lid with a vent to take off fumes. I'm not sure what concentration is needed. I guess the idea is to dissolve the stainless and keep the platinum and other metals solid. Then put them in solution and then get them...

Anybody here know what would result if you put stainless steel in a dilute sulfuric acid solution? I'm thinking of processing some metallic materials from spent catalytic converters. Seems pretty easy from what I saw... but I'm new to chemistry. I'm an electric engineer by trade.