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I have in my hand a piece of regular foam core which is acid buffered. Which is treated
a little bit to ensure that the piece that touches your frame art is not going to be
damaged by this product. It has a foam in the middle which gives it a little cushion.
It will give you good protection for 5-10 years at the most; it's not a longevity thought,
it is adequate material to use. It will be my second choice and if I had something that
I wanted to keep forever, I don't know that I would use this either. But if I had something
that was just the whimsical thing or something that didn't mean a whole lot to my heart,
that is where I would turn is to regular foam core.