Lesson 2: Sun Prints (cyanotypes)
Duration of Days: 3
Lesson Objective
Students will understand the concept of "light sensitivity" and use the sun’s energy to create a permanent photographic record of a 3D object.
1. Can the sun "draw" a picture for us? 2. What happens when an object blocks the light? 3. Why does the paper change color in the water?
Cyanotype, Silhouette, UV Light, Exposure, Develop.
VA:Cr2.1.HS1 (Experiment with materials/approaches); Physical Science (Light/UV).
Physics: Understanding the electromagnetic spectrum (UV radiation) and chemical changes.
Students place flat natural objects (leaves, flowers) or silhouettes on light-sensitive paper, expose it to sunlight, and "develop" it in water. Purpose: To explore the intersection of science and art. DOK Level 2.
The history of "Blueprints" used by architects; Anna Atkins, the first female photographer who used cyanotypes to document plants in the 1840s.
Thinking the blue "paint" will wash off in the water (it actually gets darker!). Thinking any light will work (it must be UV/Sunlight).
Physical: Use "Solar Print Paper" which is pre-coated, so there’s no messy chemical mixing. Provide a clear acrylic sheet or piece of glass to lay over the objects so they don't blow away in the wind.
Visual: For students with low vision, use high-contrast objects (thick branches or large cut-outs) to ensure a very sharp, clear silhouette.
Sensory: The "water bath" step is a great cooling, tactile sensory experience. Use a large, shallow tray for easy access.
Student will produce a high-contrast blue print and can point to the "shadow" (white area) and the "sun-kissed" (blue area) parts of the work.