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looks a little bit like Rock Wool insulation...although not exactly. I have the same in my 1910 home. Have not found any specific handling instructions for it, and have never heard that it was an issue.
 

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If it IS rock wool, wear long sleeves, gloves, mask. etc. The stuff itches worse than any regular insulation around. Agree with 1910NE that it doesn't look exactly like the rock wool of today, but it could be....
Thanks for that info! based on that, I am going to assume that what I have in my attic is NOT rock wool, but some kind of cotton stuff...
 
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