| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "OMG this is the best, Scott :-) Hey i'll be in NOLA next friday for a week! -- ig: @unterbahn | he/him/his On Thu, Jan 30, 2020 at 5:10 PM \&l..." | Read more » | almost 5 years ago | |||
| eustatic | "I did this with a Lighter and a Public Lab card, thanks to Stevie. Set the Public Lab card on a tiny fire, put it out, let it smoke up the sensor,..." | Read more » | almost 5 years ago | |||
| piyasidayanmain | "Breaking news for everyone Visit at Chennai-escort.com and fix your dating with independent Chennai escorts girl with genuine price, in my opinion ..." | Read more » | almost 5 years ago | |||
| crispinpierce | " Hi Stevie, Thanks so much for carrying out these tests. The results seem logical given the particle sizes of the solids you tested (e.g., sugar cr..." | Read more » | over 5 years ago | |||
| warren | " I'd love to combine this with a microscope activity to look at each of the powders for scale! " | Read more » | over 5 years ago | |||
| stevie | " Not too long. Maybe 3-5 seconds " | Read more » | over 5 years ago | |||
| warren | "@warren awards a barnstar to stevie for their awesome contribution! " | Read more » | over 5 years ago | |||
| warren | "Wow, this is a really great activity! And great video!!! Did the cocoa take a while to clear out and return to green? " | Read more » | over 5 years ago | |||
| gretchengehrke | "@warren, I thought the sandpaper we used (that was like a polisher) worked well to remove grime on the surface of the copper, which is its purpose...." | Read more » | almost 7 years ago | |||
| warren | "And do you have to discard the sandpaper on each use, or can it be used over and over? Thanks! " | Read more » | almost 7 years ago | |||
| warren | "Hi, i saw you mentioned: it’s almost more like a polisher regarding the sandpaper -- was that a bad thing? Would you opt for a different grade of..." | Read more » | almost 7 years ago | |||
| warren | "Just linking in here to the question where some of us have been looking for different materials and setups to do this test with: https://publiclab..." | Read more » | almost 7 years ago | |||
| warren | "Hi, gretchen - the photos are great. Do you have a list of Amazon links and prices you could add -- as a step in getting a prototyping kit together..." | Read more » | almost 7 years ago | |||
| gretchengehrke | "Here are before and after photos. We did not expect (and did not observe) any discoloration since we were only putting them out for less than 24 ho..." | Read more » | almost 7 years ago | |||
| gretchengehrke | "Here is a picture after sanding one of the little copper strips. The green pad is actually soft sandpaper / polishing paper. " | Read more » | almost 7 years ago | |||
| gretchengehrke | "Here is a picture of cutting the copper sheet into strips. " | Read more » | almost 7 years ago | |||
| gretchengehrke | "Hi @warren, Thanks for the reminder to add pictures. I have tried inserting photos a few times today, but it keeps crashing the edit (and, seemingl..." | Read more » | almost 7 years ago | |||
| warren | "And if there are any photos of these steps, i'd love to help make diagrams to illustrate the process! " | Read more » | almost 7 years ago | |||
| warren | "Hi! Do you have photos you can attach for what the copper should look like before/after H2S exposure? Or after any possible false positives? " | Read more » | almost 7 years ago | |||
| zengirl2 | "@gretchengehrke OK, ty for the response. Sounds like I need to check manufacturers about the copper tape to see how pure it is. Also, I was thinkin..." | Read more » | almost 7 years ago | |||
| gretchengehrke | "Hi @Zengirl2, I'm not sure about the copper strips. Whatever copper is used needs to be fairly pure, and I'm not sure if the copper tape is pure c..." | Read more » | about 7 years ago | |||
| zengirl2 | "@gretchengehrke Do you know if copper tape can be used? I'm considering giving testers out at the Factory Farm Summit mounted on cardboard. Also, s..." | Read more » | about 7 years ago | |||
| warren | "A comment was deleted due to violation of community code of conduct. " | Read more » | about 8 years ago | |||
| cfastie | "Thanks Patrick, The table and graphs are screen captures from Excel. The graphing module in Excel is very powerful in part because it has a huge n..." | Read more » | about 8 years ago |