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[BKARTS] Source? -- Methyl Cellulose A15C

For many years, I have been purchasing Methyl Cellulose A15C from
Bookmakers Intl., but they are now unable to obtain it. Many
conservation suppliers carry methyl cellulose, but they do not specify
the grade.
Note: the A15C is a shorter molecule, thus is better used for sizing,
whereas the A4M (still available from Bookmakers), is a longer
molecule, and is better as an adhesive, although somewhat weak. Simply
diluting the A4M will not help it penetrate the fiber structure because
of the molecular length.
Does anyone have another source for Methyl Cellulose A15C? An
alternative would be the A4C, as recommended many years ago by Cathy
Baker, paper conservator?

Thanks for your help,
Bill Minter

William Minter Bookbinding & Conservation, Inc. 4364 Woodbury Pike Woodbury, PA 16695 814-793-4020 Fax: 814-793-4045 Email: wminter@xxxxxxxxxxxxxx

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