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Glue

Loracs said:
I'm not sure about the chemical additive though.
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From the Franklin MSDS for their Hide Glue:
ammonium thiocyanate 1762-95-4 1 - 5
cyanoguanidine 461-58-5 1 - 5

I do not know anything about either compound. They never came up in pharmacology and toxicology was not a course back when.

If were me, I would switch to Old Brown.

I know that Franklin will produce a strong bond. I had a situation with a hide glue bond that was supposed to be reversed. I used too much. I clamped too tightly.
I know that hot ethanol will kill hide glue dead. But the ethanol spread to PVA bonds that were to be kept and reversed them too. I think that you can be confident in your Franklin bonds. I also used it to glue felt to the bottom of a drawer (Grestner chest kit) and was not happy with the lack of initial grip.
Old Brown is supposed to have that.
 
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Was just mentioning an alternative choice. Old brown looks great too. I'm sold on hide glue; it is a charm to use. Please note that it is not fully transparent but rather have a brown coloration. For some application that may be a deterrent... not for me so far though.
 
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Loracs said:
I'm sold on hide glue; it is a charm to use. Please note that it is not fully transparent
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The 60g Amazon hide glue flakes for violin - seems to be pretty much the same as Old Brown. It is not instant or 15 min to warm up like Old Brown. Keep the flakes in a sealed Mason jar and they will out last you. They just need about 12 hrs for hydration. I bet that if the liquid form is in a sealed container and put in a freezer, it will last a long time. It is just a matter of the time to thaw. Hide glue is a protein. Too much heat and it will do what egg whites do when cooked. For hide glue the absolute max seems to be 150-160 degrees F.

Lee Valley has a model side hot pot. It is a water bath for its glue pot and a preset temp for the hot plate. It is not described in any instructions, but I have a feeling that any leftover liquid glue can be stored in a closed container (pt. Chinese takeout liquid container?) in a freezer for a long time instead of mixing fresh everyday.
It is a wider variety of glue behaviors, with an additional iniital outlay for the pot. If the freezer thing works, it is about as convenient as pre-mixed liquid without the short shelf-life factor.
 
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