Date: Tue, 17 May 2011 16:20:28 -0400
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Johnson, Amy Carr" <amy_johnson**At_Symbol_Here**HARVARD.EDU>
Subject: Piranha solution

I have been reading about how to make Piranha solution and I keep coming across this statement,  “Add the acid to the peroxide, although some authorities disagree”   Why would authorities not agree that adding acid to water instead of water to acid is best?

I have seen some say add acid to peroxide for initial solution, but when refreshing, add aliquots of hydrogen peroxide to Piranha mixture.  Is that ok?

We recently had an incident when Piranha came in contact with ferric chloride and instantly reacted

violently Was this due to the metal, the fact that both are oxidizers, both, or something else?

I have read that neoprene gloves should always be worn.  True?

What type of glass is appropriate for containment?

Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.