Richard,
When I was at the Detroit Institute of Arts we came across the same
problem. It was either talc or oil! You could try contacting Terry
Birkett, the Collections Manager, I believe he has invesitgateds sources
for "clean" plastic. I don't hink he's on email. But call him, 313 833
7900.
Good luck.
Suzanne
************
Suzanne Quigley
Head Registrar, Collections and Exhibitions
Solomon R. Guggenheim Museum
1071 Fifth Avenue
New York, NY 10128
212 423 3568
fax: 212 423 3650
email: [log in to unmask]