Kristy,



That is not true. Acryloid B-72 is reversible and has been extensively treated for ahrung properties and should be fine for 100 years or so. 



What matters most, as in all things concerning historic and artistic objects and artifacts, is the nature of the material/media. Of course if you apply Acryloid to a porous media such as paper or textile if will be basically irreversible. And although irreversibility is the optimum it sometimes cannot be always followed - archaeological materials, especially waterlogged artifacts, are a good example. Often you have to be a little more invasive and less ireversible if you have a very fragile object or artifact that cannot survive unless it is consolidated in some way. Many years ago I did a consolidation treatment on a cloth button from a well from a 1620's fort site in Virginia where the water was slowly removed by solvent replacement and the while still immersed the button was vacuam impregnated with a dilute Acetoud B-72 solution. Now, more than 20 years later the button is still in fine condition. Preserved, yes, irreversible, not likely. 



Cheers,

Dave



David Harvey

Conservator

Los Angeles, CA  

Sent via BlackBerry from T-Mobile



-----Original Message-----

From:         Kristy Caratzola <[log in to unmask]>



Date:         Thu, 28 Feb 2008 14:18:53 

To:[log in to unmask]

Subject: [MUSEUM-L] Reversiblity of B-72





I've recently heard that B-72 Acryloid is irreversible.  If this is true why is it 

marketed as a liquid labeling product for Collections Objects?  What should be 

used to label Collections Object that is reversible and archivally sound?



Kristy Caratzola

Planting Fields Foundation

Oyster Bay, NY



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