Rusted tissue paper

I was finally putting away my rusted pieces over the weekend.  I was about to clean my mats and thought that it was such a waste to just wash away that beautiful rust.  I wanted to save it or transfer it some how....and then it hit me. 

I took out some of my Tim Holtz printed tissue paper and then wet down the mats.  I sopped up the liquefied rust onto the tissue paper and let dry.  OMG I so love.  Now I can use on all sorts of projects.  I cannot wait.