Why are blueprints no longer blue?

Related questions

1. How do you read room dimensions?
2. Why is it called Blueprint?
3. How do blueprints work?
4. Who invented blueprint?
5. What is called Blueprint?
6. What code does ue4 use?
7. How much does ue4 cost?
8. What is included in a blueprint?
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10. Which walls are load bearing?

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14. #ammonium
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21. #solution
22. #someone
23. #translucent