I have really been enjoying some of the alternative processes. Cyanotypes is a process that uses a solution of iron compounds. This is a process from the 1800's and has not changed much. The process is made of two solutions that you mix equal parts and then it can be painted on paper or fabric, basically anything that is absorbent.  Then you place a negative that can be film or created from digital images on the paper.  You expose it in the sun or a uv lamp then rinse it in water. The darks in the negative are blue and the highlights are white.