Granite paper

Granite paper has tiny colored fibers or threads embedded in the paper. It has been used as a security feature.

It is a good idea to examine both the front and back to check for a type or variety with granite paper. In some cases, the threads can be large and obvious, sometimes as clear as if dumped in someone's sewing basket. Other times, there might be only a few very fine fibers in the paper. Do not confuse paper impurities like bits of bark or unbleached paper fibers for the chopped cloth or thread pieces that make up granite paper.  File:Austria stamp back.jpg|Very clear and obvious threads in this Austrian stamp. File:Switz back.jpg|Very fine blue and red threads here in this Swiss stamp. For those, threads can range from fine sewing thread size to just a handful of tiny fibers. 

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