12 minutes | Wednesday, 3 January 2024
The story of why blueprints were blue is more involved than you think. It involves a chemical process and the Prussian Army. Yeah you heard me right.See omnystudio.com/listener for privacy information.
12 minutes | Wednesday, 3 January 2024
The story of why blueprints were blue is more involved than you think. It involves a chemical process and the Prussian Army. Yeah you heard me right.See omnystudio.com/listener for privacy information.