477 views

2:18

Watch
- Search Videos
  
  Advanced search »
- Submit a New Video
Discuss
About
- Try clicking on the various channels to see videos posted to that channel - if you're into music you can click the Music channel to get more music sifts - go on and explore! Use the "hotness" when you have opened the channel link to get videos that have gotten a lot of votes, or use "newness" to have a look at the new sifts.
  When browsing sifts you like, have a look at the Related Posts list to see other related videos, click the tags under the video title to see more sifts tagged with the same tags or have a look at other sifts from the same user in the More Posts By list. If the sifted video is in a play list, have a look at the play list to see other interesting videos the Sift users have linked together.
  Enter the Sift Lounge to chat with online sifters about anything and everything, or read interesting posts in the Sift Talk forum.
  The Top New Videos list is always full of interesting, current videos. It is always recommended that you have a look through the Top New Videos, but also have a look at these:
  - Upcoming Unsifted Videos - active video submissions that neither are published to the front page nor archived to the submitter's personal queue
- Have you seen a really funny, surprising, scary, interesting, cute or in any other way extra good quality video?
  Post and share it here - VideoSift is the best video aggregator on the Web, where we share, discuss, promote, and interact with the best videos out there on the web. Post it here, and share it with the large community of video-interested users. And - you are guaranteed to find more very good videos here already!
  Mind you, we only share videos you discover that someone else has made; if you "self link," by posting a video you have made, have posted or have interests in, you risk the ban hammer - read the posting guidelines before posting. The sift is NOT for promoting your own videos - it is for sharing videos others have made.
  Submit a Video Now »
Login

Why are blueprints blue? - Big Questions - (Ep. 206)

submitted by Aard Vark

(oritteropo)
8 years 8 months ago

YouTube Description:

A weekly show where we endeavor to answer one of your big questions. This week, David Lev asks, "Why are blueprints blue?"

---

Mental Floss Video on Twitter: http://www.twitter.com/mf_video

Select Images and Footage provided by Shutterstock: www.shutterstock.com

Want more of Craig?
https://www.youtube.com/wheezywaiter
https://www.youtube.com/thegoodstuff

2 Comments

ravioli

says...

But he doesn't explain how the reaction is stopped

oritteropo

says...

I actually made a cyanotype print in high school chem class (a long time ago!). The process is that you make the solution, paint it on the paper, let it dry in the dark, put the object or negative on top, expose to sunlight (or UV light), and then rinse it in water to fix the print.

I also found this set of instructions which confirmed what I remembered

http://www.alternativephotography.com/wp/processes/cyanotype/cyanotype-classic-process