[Rockhounds] concrete/cement

[Alan Goldstein]

It should remove the concrete residue quite easily. I'd use a small amount 
in a gallon of water. Don't get too close to see if it is working! You'll 
hear it fizz. The fumes are quite potent even in small amounts. Make sure it 
is an open, airy space. Leave it in overnight. Soak it in fresh water for a 
while afterwards just to be safe.

Alan


----- Original Message ----- 
From: "June Young" <jayhawkmn at yahoo.com>
To: <rockhounds at lists.drizzle.com>
Sent: Monday, October 22, 2007 5:33 PM
Subject: [Rockhounds] concrete/cement


>I have a piece of jasper  that appears to have concrete/cement on it.  I 
>have picked off a great deal of the concrete but it still has a white 
>colored coating.  Will muratic acid take off this final layer?  If so, 
>should it go in at 100%?  How long should it stay in?  Will it need to be 
>scrubbed with a steel brush?  Does muratic acid loose its effectiveness if 
>it has been around for many years?
>  Thanks for your help.
>  June
>
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