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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 » almost 7 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 » almost 7 years ago
danbeavers "I wonder if just plain cotton balls would work just as well? " | Read more » almost 7 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 » almost 7 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 » almost 7 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 » about 7 years ago
Bob "Here are the links: http://publiclab.org/notes/caseyrcampbell327/09-29-2014/bridget-casey-s-water-sample-locations https://www.youtube.com/watch?..." | Read more » almost 8 years ago
PAPY_DANIEL_02 "I think that these instructions leave a lot of details "in the dark" and I have a lot of questions about mounting my own spectrometer (exact distan..." | Read more » almost 8 years ago
ernestbolds "At this time I will just say that it is an material that is reoccurring in my immediate environment (an community apartment building) and I do beli..." | Read more » over 9 years ago
warren "Huh, here is a link for where to buy such bags: http://www.alertsecurityproducts.com/evidence-bag/index.shtml " | Read more » over 9 years ago
warren "Hi, Ernest - what kind of sample is it? A water sample? Where did it come from? What do you suspect it contains and why? Our community's spectrom..." | Read more » over 9 years ago