Separating 1915 poster Stamps stuck together

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I have a set of large stamps of the 1915 PPIE that have stamp adhesive and are stuck together.  I tried to carefully separate, but the adhesive is too strong.  Applying heat did not work.  Suggestions?

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    Posted by (Questions: 1, Answers: 1)
    Asked on April 18, 2021 6:37 pm
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    I have not had to do this before, but the adhesive is likely moisture activated so try humidification!

     

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    Posted by (Questions: 0, Answers: 158)
    Answered on April 18, 2021 7:04 pm
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      Thanks.  Thought of that, but hesitant to try moisture. 

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      Posted by (Questions: 1, Answers: 1)
      Answered on April 18, 2021 7:14 pm