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Great article. I also have a book about caring for plastics that is very useful. However, this thread was started not because of the inherent chemistry of plastics, but what might be causing a reaction between the plastic and objects in our collections. In our case I really think its a matter of residual chemicals on the artifacts that are reacting to the potentially impure plastic. I think most conservators would rather us not scrub the materials to a shine, but there may have to be some way of preventing this discoloration.
Love to hear from more people and their experiences. It seems like this is a common problem and yet, no one has answers.