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RE: TIL Why We Call Schematics ‘Blueprints’
Nice article!
Similar chemicals were used to make the famous Prussian Blue ink.
Nice article!
Similar chemicals were used to make the famous Prussian Blue ink.
Yea! The blue of original schematics was named Prussian Blue, prized for its ability to resist fading. :)
You inspired me to write an article on toning black & white photos.