| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| danbeavers | "The cotton balls that I have do not have brighteners. I checked with my UV laser. I was wondering if they have the same absorption characteristic..." | Read more » | over 8 years ago | |||
| mcairns | "Hi All, Tampons shouldn't contain brighteners--we tested several different types, from the "all natural and organic" types, to plain old Tampax, to..." | Read more » | over 8 years ago | |||
| danbeavers | "I wonder if just plain cotton balls would work just as well? " | Read more » | over 8 years ago | |||
| gretchengehrke | "What kind of tampons did you use in this experiment? I was just looking up tampon materials, and it looks like different brands use cotton, rayon,..." | Read more » | over 8 years ago | |||
| warren | "This is one of the first things that was done with UV fluorescence with the Public Lab Spectrometer -- showing brighteners in free & clear laun..." | Read more » | over 8 years ago | |||
| gretchengehrke | "This is great. Using absorbent materials to concentrate aquatic contaminants for analysis has a good, long history and the next step -- extracting..." | Read more » | almost 9 years ago | |||
| btbonval | "As an example of something with low specific heat capacity, you could fill your fridge with metal pots. Although the pots won't fall out of the fri..." | Read more » | over 9 years ago | |||
| btbonval | "As a heads up, the contents of the refridgerator can make a huge difference. If you have a fridge with nothing in it at all, the fridge is only co..." | Read more » | over 9 years ago | |||
| sara | "Thanks for sharing your project! Particularly the easily made error of covering up sensor. It's a great reminder to the rest of us! " | Read more » | over 9 years ago |