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Hi, hoping someone can help.

When creating plaster models from a silicone mold, I'm noticing dark marks at the seam line which do not disappear when fully dry - even after weeks. I don't use any mold release or oily products that would account for it.

Does anybody have any idea of what is causing this and how to prevent it please?
Eyelash Slope Event Auto part Automotive exterior
 
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