Glycerin in isinglass

I have been researching the addition of glycerine to Isinglass
(sturgeon bladder glue). It is referenced in a number of
publications that isinglass becomes brittle unless a humectant such
as glycerine or honey is added to the adhesive. It seems from
reading articles that conservators have been adding glycerin to
isinglass, but note in their publications that it's aging properties
are unknown. Does anyone know of any research or publications that
are exploring this?

Natasha Hogan
MA Conservation Student
Camberwell College of Arts
University of the Arts, London


                                  ***
                  Conservation DistList Instance 23:36
                  Distributed: Monday, March 22, 2010
                       Message Id: cdl-23-36-029
                                  ***