Why is it called Blueprint?

Related questions

1. Why are blueprints no longer blue?
2. How much do blueprints cost?
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4. How much does ue4 cost?
5. What is Blueprint Service Marketing?
6. What is called Blueprint?
7. What code does ue4 use?
8. Can a 2x4 wall be load bearing?
9. Who invented blueprint?
10. What is the difference between a blueprint and a drawing?

Tags

1. #paper
2. #making
3. #color
4. #prussian
5. #where
6. #because
7. #drawing
8. #blocked
9. #original
10. #covered
11. #blueprinting
12. #caused
13. #known
14. #light
15. #technique
16. #black
17. #except
18. #wondered
19. #other
20. #lines
21. #blueprints