Core blighted

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Senior Member
I want to know idiomatic expression for the following situation.

External appearance is very good. But, the core is blighted. ( Inner content is terribly bad like nicely-packed and bound textbook contains material of little value.
  • cuchuflete

    Senior Member
    Another saying may apply-- Beauty is only skin deep.

    I have seen an acerbic variation of that well-known saying:

    Beauty is only skin deep, but ugly goes clean to the bone.
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