From: DCHAS Membership Chair <membership**At_Symbol_Here**DCHAS.ORG>
Subject: [DCHAS-L] Could anything go wrong with this mix?
Date: Mon, 12 Mar 2018 15:02:35 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Message-ID: 807101CA-B656-4E7C-93D3-D3AF22F03475**At_Symbol_Here**

From: Monona Rossol
Re: Could anything go wrong with this mix?

I got a question from a museum here in NYC that is using a complex mixture to clean a artifact. I need help to be sure there is nothing here that could be a problem.

First they mix
100ml water (distilled)
0.5g Citric acid (chelator)
0.5g Boric acid (buffer)
Adjust pH to 8.0 with 1M NaOH solution

This mixture is added to 200ml of 2% xanthan gum in DI water which makes a gel

Next they add to the gel
12% of a solvent mixture that is a 6:1:1 mixture of benzyl alcohol : ethyl acetate : diethyl ketone
then they add 8% Shellsol OMS.

Monona Rossol, M.S., M.F.A., Industrial Hygienist
President: Arts, Crafts & Theater Safety, Inc.
Safety Officer: Local USA829, IATSE
181 Thompson St., #23
New York, NY 10012 212-777-0062

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