Share this page!

Enter URL or ID to Unroll

You can paste full URL like: https://x.com/threadreaderapp/status/1644127596119195649
or just the ID like: 1644127596119195649

How to get URL link on X (Twitter) App

  1. On the Twitter thread, click on or icon on the bottom
  2. Click again on or Share Via icon
  3. Click on Copy Link to Tweet
  4. Paste it above and click "Unroll Thread"!
  5. More info at Twitter Help
AngusAlchemist Profile picture
AngusAlchemist
@AlchemistAngus
Lab tech, element hunter, plant botherer. Here comes the science...
Jan 30, 2022 • 8 tweets • 4 min read
What has Scotland given the world? Television, penicillin, strontium, ice hockey, Lemmings and red cabbage indicator. Yes, when he wasn’t tinkering with steam engines, James Watt, born in Greenock OTD but not OTDate in 1736, invented the #GardenIndicators staple. (1/8) Boyle’s syrup of violets was old news and litmus was the latest in indicator technology. Watt noted litmus is sensitive to one part sulfuric acid in 100 000 parts of water (0.1 mM, pH 4, though moles and pH hadn’t been invented yet), and even carbon dioxide turned it red. (2/8)