Making my own blueprint | Summary and Q&A

June 10, 2018
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Making my own blueprint


This video demonstrates the process of making cyanotype using Prussian blue pigment and explains the chemistry behind it.

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Questions & Answers

Q: What is the cyanotype process?

The cyanotype process is a photographic printing process that uses a light-sensitive solution to create blueprints directly on paper. It involves forming Prussian blue pigment on the paper through exposure to UV light.

Q: How is ferric ammonium citrate made?

Ferric ammonium citrate can be made by reacting ferric chloride with citric acid. The YouTuber in the video follows a procedure from the 1950s, downscaling and altering it to make the compound.

Q: What is the role of Prussian blue pigment in cyanotype?

Prussian blue pigment is used to color the cyanotype solution. When exposed to UV light, the ferric ammonium citrate in the solution reduces to iron two-plus ions, which then react with potassium ferrocyanide to form Prussian blue on the paper.

Q: How is the cyanotype exposed to UV light?

The paper coated with the cyanotype solution is placed under a transparent template and exposed to direct sunlight for a specific duration. UV light catalyzes the degradation of ferric ammonium citrate, causing it to react with potassium ferrocyanide and form Prussian blue in the exposed areas.

Summary & Key Takeaways

  • The video explores the cyanotype process, which involves forming Prussian blue directly on paper using Prussian blue pigment.

  • The YouTuber makes ferric ammonium citrate from scratch using ferric chloride and citric acid.

  • The ferric ammonium citrate is then used to create a light-sensitive solution, which is applied to paper and exposed to UV light to form a blueprint.

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