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this huge info could be compiled for an article with more information.. telling the advantages/disadvantages to use this or other system (for dissecating, for storing, for pinning, etc etc)

Susan:
"Some good quality plastic bags are made from inert polyester. It is generally extremely difficult to find out from the manufacturers though."

yes.. :( thanks!

I will try to seek for art supply stores in Porto. But I just can go there in next month.

I will see those sites and then I will let know which references I'm thinking about to buy. MOre later.

Thanks, once again.