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Re: [BKARTS] isopropanol question

On Nov 7, 2006, at 8:01 PM, Lavinia Adler wrote:

I've gotten no response from my Cellugel vendor, so I'll ask here. I
assume when the label states that the product can be diluted using 100%
isopropanol, they mean the bottle of isopropanol I buy should not include
any percentage of water, not that I can use a bottle marked 70% or 93% as
long as I don't add anything else into the mix.

On Nov 8, 2006, at 9:48 AM, Heather Wright wrote:

100% isopropanol solution is extremely flammable as you are well aware therefore it is usually advised to dilute the concentration to a 70% working solution to avoid any chance that residual could flash ignite (due to sparks, static, heat, flames, etc.) The solution is comprised of ethanol, alcohol and methanol sometimes. You will always dilute it with water - and distilled if you have access to it.

Remember, as stated by others that water should not be used with older leather.
HOWEVER, one should also realize that any of the alcohols -- as well as preparations of Klucel G and Cellugel -- will absorb water from the atmosphere and when it reaches a certain proportion, it will definitely affect the leather that your are trying to treat.
Tony Cains had an experience with Klucel G that had absorbed too much water ---- see his comments in CONSERVATION OF LEATHER, Kite and Thomson, 2006, page 226 --- "Klucel absorbs moisture from the atmosphere....". This book also contains other valuable information about working with leather --- a must read for all book conservators.
Bill Minter

William Minter Bookbinding & Conservation, Inc.
4364 Woodbury Pike
Woodbury, PA  16695
Fax:   814-793-4045
Email:    wminter@xxxxxxxxxxxxxx

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