[TheForge] Pit cast iron (or steel?)

[Andrew Vida]

Best is salt water.  Just look at any steel that has been in salt or 
brackish water for a while.  It gets deep, shiny pits.  The downside is 
that it takes time.

Another thing you can try is cat urine.  That has to be some of the most 
horrifically corrosive stuff on the planet.  It is the only thing I know 
of that turns stainless steel jet black.

Bruce Freeman wrote:
> A friend is working on an artistic casting, currently with a ground
> surface.  He wants to "age" it by pitting and rusting.  He's tried
> muriatic acid (at cold, outdoor temperatures) and it's a no-go so far.
> 
> I've advised him  NOT to move muriatic inside.  He's thinking about
> other chemicals and could use some advice. Does anyone have practical
> experience trying to accomplish such pitting, and can tell how?
> 

-- 

	-Andy V.

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