From what i gather "Un vieux parchemin" would be correct. Why is "Un extrêmement vieux parchemin" incorrect? Thank you.
This is a special case where adjectives modified by multi-sylable adverbs always follow the noun even if, normally, the adjective goes before the the noun: In your case:
Un très vieux parchemin BUT Un parchemin extrêmement vieux.
Hope this helps,
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