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old glue that is grey?

 
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Mat Roop
Senior Member


Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Wed Mar 22, 2017 10:42 pm    Post subject: old glue that is grey? Reply with quote

Every once in awhile I get a violin for repair and when opened up the old glue residue is an opaque beige-grey in color. It is water soluble but certainly does not look like the hide glue that is standard these days.

Was it just a less pure form of hide glue? or something else?

Thoughts?

Cheers, Mat
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Rick M
Member


Joined: 18 Sep 2016
Posts: 65
Location: Okotoks, AB, Canada

PostPosted: Wed Mar 22, 2017 11:46 pm    Post subject: Reply with quote

What came to mind when you describe beige-grey glue was Casein.

I recall helping my Dad mix up batches of the nasty stuff as a kid, but can say I recall what it was like dried out. Again, distant memory but clean up with vinegar maybe.
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Chet Bishop
Super Member


Joined: 23 Mar 2007
Posts: 678
Location: Forest Grove, Oregon

PostPosted: Thu Mar 23, 2017 9:13 am    Post subject: Reply with quote

There have been numerous water-soluble glues used:
    Hide-glue
    Rabbit-skin glue
    bone glue
    fish glue
    isingglass (glue made from sturgeon bladders)
    casein (milk solids by-product)


The only one I really am familiar with is the hot hide-glue...and even it varies all over the board, in terms of looks: How fresh was it, how clean was it, what grade was it to begin with. Some are very clear, some have quite a bit of color. I tend to try to use the clear grades.

I dread seeing polyurethane glues, epoxy and even Elmer's glue in violins. It always turns out to be a bit of a nightmare. If I can tell ahead of time that epoxy or polyurethane is involved, I have simply refused the job...and probably will do so again. the problem is that you can't always see it before you open the fiddle, and then you are sorta committed.

It sounds like you at least have something workable, since it is water soluble.
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Chet Bishop
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