Black Quote by Wilder Dwight Bancroft
“There is one experiment which I always like to try, because it proves something whichever way it goes. A solution of iodine in water is shaken with bone-black, filtered and tested with starch paste. If the colorless solution does not turn the starch blue, the experiment shows how completely charcoal extracts iodine from aqueous solution. If the starch turns blue, the experiment shows that the solution, though apparently colorless, still contains iodine which can be detected by means of a sensitive starch test.”
About This Quote
Source Laboratory Notebook, 1902
An experiment demonstrates charcoal’s ability to remove iodine, revealing hidden substances via starch test.
In simple terms: Charcoal extracts iodine; starch test detects remaining iodine.
Key Takeaway
Use simple tests to uncover hidden chemicals.
Themes
science
experiment
discovery
Mood
analytical
educational
Type
scientific
practical
When to use this quote
- water purification
- lab analysis
- educational demos
- quality control
Key Concepts
adsorption
chemical detection
Questions to Reflect On
- What other substances can charcoal adsorb?
- How can this test be applied in field settings?
A Different Perspective
Results may vary with charcoal quality and concentration.
