In this part of today's experiment you will produce cyanotypesusing watercolor paper. Directions 1. Each student should obtain apiece of 4” x 5” watercolor paper. Work with ONE partner. 2. Eachpair should prepare the following solution in a 250 mL beaker. 1.2gferric ammonium citrate 0.6g potassium ferricyanide 20 mL of water3. Stir until dissolved and describe the color of the mixedsolution. ______________________ 4. Place the paper in one of theplastic trays under the hood. Using a flat foam brush, coat oneside completely with the solution. Wipe first in one direction andthen a second time at a right angle to the first direction. 5.CAREFULLY dry the paper using a hot air gun, or place in the ovenin the Prep room. 6. When dry, print the dry paper by clipping alarge negative image on top of the paper and exposing it tosunlight (outside, if it’s sunny) or a UV light source (inside). 7.When the exposed regions of the paper are changed in color to adeep blue-green, unclip and remove the negative. 8. Wash the paperwith a gentle stream of tap water to remove the soluble unreactedlight sensitive chemicals. 9. Dry the blueprints with a hot airgun, or in the oven in the Prep room.

Discussion Questions

1. What develops the image?

2. What works as the fixer for the image?

3. Write balanced chemical equations for the reactionsobserved.