Hide glue does shrink up but instead of pulling away and opening gaps, 
it sucks the parts being glued up tight to each other.

On 2/23/2012 3:55 PM, Thomas Conroy wrote:
> I
>   seem to remember that this is one of the things high gel strength glue
> is used for. Up in the 500 range, even. The high bloom glues will accept
>   a lot of water for a given strength and viscosity, which suggests to me
>   that they would shrink a lot when they dry.  You might even try
> gelatine (super-high gel strength, maybe over 1000 on the glue scale), I mean
food grade like Knox, or dope
> woodworking hot glue with food gelatine. Different bloom strengths may
> produce different crackles.
>
> I use small glass jars for glue pots,
>   and I find the dried glue around the rim where I wipe the brush really does
pull off the surface of the glass; or if I leave the jar on the heat
>   overnight and the water all evaporates off, the surface of the bottom
> of the jar can be pulled off. Watch out for flakes of glass in the dried
>   glue; I have cut my fingers on flakes a quarter of an inch in diameter
> when cleaning out
>   overcooked glue.
>
> Tom Conroy
>
>
> Jim Thompson wrote:
>
>> This sounds like a trick I could use in my stained glass work. I will
definitely try it.
>> On Feb 23, 2012, at 8:22 AM, Richard wrote:
>>>
>   Another trick with hide glue is to put it on a piece of glass. When the
>   glue drys it will
>>> pull up small silvers of the glass giving the glass a
>   look like ol' jack frost has done  it.<<
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