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Re: [GBW] [BKARTS] Questions about methyl cellulose



 Being a long time user of Golden Artist Colors and methyl cellulose, I have several comments.? 

My experience is that the high quality MC that we purchase at our various bookbinding suppliers is not acidic.? I have checked this repeatedly over the years.? MC from home centers and paint stores is likely another matter and would certainly not be of as high a quality as we are used to.? I also know from my teaching experience that students will cut costs and will generally purchase less expensive materials if available.? They will also push the envelope and perhaps mix a higher percentage of MC to Acrylic than I would recommend.? MC can perform the same type of transparency that many of the Golden mediums can provide. It does not provide the same elastic quality and permanence that an acrylic medium would.

For a mix of acrylic and mc to adhere to my paste papers I recommend at least a 50% mix of acrylic to paste of any kind.? If you want transparency of color you can use less paint but would need to substitute some sort of acrylic medium to accomplish a miniumum of 50 % acrylic.

This recommendation is a result of some issues I had experienced over 20 years ago.? At the time I had just opened a new carton of Mohawk Superfine, a new shipment of MC, and opened new jars of paint for a job for Campbell Logan Bindery.? Much to my chagrin the base color I applied wiped right off the paper! As it turned out the source of the MC was part of the issue.?? My water source in Schodack Landing was also suspect.? I now only use distilled water when mixing MC. 

I also need to note that Elaine Haas at Talas,? Golden Artist Colors research team, and Scott Petrquin at Mohawk Mills all were extremely helpful in my quest to solve the problems.

Hope this is helpful!

Claire Maziarczyk


 

-----Original Message-----
From: William Minter <wminter@xxxxxxxxxxxxxx>
Cc: The email list for Guild of Book Workers member communications <gbw@xxxxxxxxxxxxxxxxxxx>
Sent: Fri, 2 Jan 2009 6:43 pm
Subject: Re: [GBW] [BKARTS] Questions about methyl cellulose










I do not have an answer, but I have wondered if there could be any  
difficulty of mixing methyl cellulose with acrylics. In fact, I asked  
this very question at the recent GBW Standards conference.
The people at Golden certainly should have some comment or suggestion  
on this topic, as you have suggested. However, I am surprised to hear  
them say that methyl cellulose is acidic. I do not think that that is  
true.
On the other hand, there are many of us who are mixing these two  
materials/compounds for a variety of end uses. Obviously, there is a  
need to determine if there could be a problem. If the manufacturers  
of the acrylics do not have an answer, they are probably not going to  
do the research unless it becomes a financial problem for them.  
Therefore, the concern falls into our lap as the end-user. Since it  
is common for book arts people to mix these compounds, someone, at  
some level in the book arts community, needs to provide the research  
to answer such a question.
Bill Minter


On Dec 30, 2008, at 11:13 AM, Laurie Doctor wrote:
I have worked with methyl cellulose in bookmaking and in acrylic  
painting (using it as an additive to the paint) and haven't had any  
problems. Recently a student had a problem with an acrylic varnish  
taking up some of the acrylic paint on the surface of her piece and  
said the folks at Golden thought it could be the methyl cellulose,  
and also claimed that methyl cellulose could cause yellowing  over  
time -- that it is acidic.
Does anyone have any thoughts on this?


******************************

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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****************************************************
GBW: The email list for GBW member communications

GBW Standards - October 16-18, 2008
Toronto, Ontario
More info at http://palimpsest.stanford.edu/byorg/gbw/standards.shtml

The GBW website is supported and maintained by
Conservation OnLine http://palimpsest.stanford.edu/byorg/gbw

To post messages, email to GBW@xxxxxxxxxxxxxxxxxxx

For problems, contact Eric Alstrom, List Manager:
gbwlist@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

For info about the list, visit http://mailman.lib.msu.edu/mailman/listinfo/gbw
****************************************************


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