Cyanotypes

This is a photographic printing process that produces cyan blue prints.  Engineers started to use this process well into the 20th century to create blue prints. They are made up of two simple chemicals which are blended together equally these are, Ferric ammonium citrate and potassium ferriccyanide. The chemicals are put onto the paper and left to dry. Then put your object (leaf) onto the UV light and put the paper on top with the chemical side facing down, then close the light. Put the latches down on the sides and twist the blue knob to release the air and then switch the UV light on for two minuets. Finally rinse the chemicals off and leave it to dry.