preparing collage for final paintings

Its always exciting to make bits and pieces to use as collage elements. I found some ribbed cardboard in my box of stuff that might come in useful one day and thought this would work for adding surface texture and representing some of the rock layers. I have been using collage to work out shapes and have experimented with this in previous work.  Using a roller I applied acrylic ink to the surface of the cardboard and then using Gampi paper, a thin japanese paper, I transfered the ink, this made interesting uniform but characterful textures. I used a few different colours and made a stack of them so I could rip them up and use fragments or cover larger areas.