| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| liz | "Here's the link to the article mentioned above: http://www.labmanager.com/lab-product/2010/10/evolution-of-the-ph-meter#.Wcl9xUqGP-k " | Read more » | about 7 years ago | |||
| liz | "I found this webpage that describes how to use either red cabbage, turmeric, radish, or elderberry to make a quick and short term color change test..." | Read more » | about 7 years ago | |||
| gilbert | "Arnaldus de Villa Nova around the year 1300 is credited with developing a litmus test for pH, (Chemical Education Digital Library), utilizing a blu..." | Read more » | about 7 years ago |