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Re: [BKARTS] Book Board identification

What you have discovered is tar board. as per Etherington & Roberts: (ie millboard.)

Standard millboard is tough and strong, borne of its fibre structure.

This board could be millboard, but if it is, then it is a really cheap version, with little or no strength and firmness. It is very flexible, and bends into a tight U-shape without breaking. Under a microscope, it looks more like compressed tar with a few interlocking strands of something.

So perhaps it is just a cheap millboard, or, as you stated, tar board.


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