what is print, duplexing.

duplexing refers to the bonding of two substrates to form a single one.
Gives a really interesting finish to a design with the stock to have two different colours, textures and finishes. Also if you lay 3 stocks ontop the same on the top and bottom with a thicker coloured stock in the middle, it gives a really nice layered effect to your substrate with the width being a different colour to the stock. like here...