| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Ag8n | "It looks like a single beam instrument was used for this work. With a double beam instrument, there is no need for phrases like "OD435/OD415". Th..." | Read more » | almost 3 years ago | |||
| Ag8n | "Some vehicles, in most major cities, have to be tested annually for fuel emissions and mpg. Not all vehicles must be tested and the fuel emissions ..." | Read more » | almost 3 years ago | |||
| Ag8n | " Lichen1.docx Hopefully, this will attach. " | Read more » | almost 3 years ago | |||
| Ag8n | "In this area, lichens aren't common. Attached is a rough draft using lawn clippings to set up and test using various instruments. Don't know how ..." | Read more » | almost 3 years ago | |||
| Ag8n | "If using an instrument like a hunter colorimeter, be careful. There is the Hunter L,a,b scale. Then there is the cie L,a,b* scale. Most instrumen..." | Read more » | almost 3 years ago | |||
| Ag8n | "Little change here. Most water or liquid measurements are on transmitted or absorbed light. " | Read more » | almost 3 years ago | |||
| Ag8n | "Its very easy to get these two instruments confused. If you are measuring color in industry(as in paint color, siding color, etc), its often with ..." | Read more » | almost 3 years ago | |||
| Ag8n | "The tungsten lamp remarks only apply to the 660 nm red lines. " | Read more » | almost 3 years ago | |||
| Ag8n | "Best bet- use an old fashioned tungsten lamp. Not a LED claiming to be a tungsten lamp. An LED has a narrow bandwidth. An old fashioned tungsten..." | Read more » | almost 3 years ago | |||
| Ag8n | "Looking into the 660 nm lines. It's not that LEDs don't exist for 425 nm region. They do. But the ones in the catalogs seemed expensive. Going ..." | Read more » | almost 3 years ago | |||
| Ag8n | "There are 3 in 1 flashlights ( blue, white, and red) that would be good for this application- as long as the color was more like purple instead of ..." | Read more » | almost 3 years ago | |||
| Ag8n | "If you are using the public lab spectrometer, a light source for around 400 nm is needed. It looks like there are some blue or violet led bulbs/ f..." | Read more » | almost 3 years ago | |||
| Ag8n | "A test of this method might be to use lawn clippings and run it through the procedure. The idea is to extract chlorophyll, which should be presen..." | Read more » | almost 3 years ago | |||
| Ag8n | "Another, more current option , is to use a coffee grinder. With the temperature issues this material shows, probably using the frozen state would ..." | Read more » | almost 3 years ago | |||
| Ag8n | "As for the mortar and pestle, there are many options. Some mortar and pestles are very expensive, but they don't have to be. They should be easy t..." | Read more » | almost 3 years ago | |||
| Ag8n | "Was checking one of the online vendors. Found new centrifuges for $70. Industrial quality centrifuge costs were much higher, but who knows. If y..." | Read more » | almost 3 years ago | |||
| Ag8n | "Ok. Trying to stay as close to duplicate the original paper as closely as possible. R.la cera isn't in this area. But other closely related liche..." | Read more » | almost 3 years ago | |||
| Ag8n | "One word of warning. Solvents ( like acetone) and plastic cuvettes do not usually go together. The worst case is the plastic melts, but the plast..." | Read more » | almost 3 years ago | |||
| Ag8n | "Still have to do more work. But the acetone extract seems like something that might be doable in a home lab type situation. The acetone extract i..." | Read more » | almost 3 years ago | |||
| Ag8n | "This looks great!! Thank you! Is this also a way around all the different platforms ( windows, linux, etc.)? " | Read more » | almost 3 years ago | |||
| Ag8n | "How does it compare to wxtoimg? The picture sure looks good. " | Read more » | almost 3 years ago | |||
| Ag8n | "This one is difficult. Carbon dioxide isn't transported through pipelines as a gas. Instead, they are talking about sending it through as a super..." | Read more » | almost 3 years ago | |||
| Ag8n | "I went to ohiomosslichen.org/ to see what's in the ohio area. Didn't seem like there was anything directly comparable to the lichens in the paper..." | Read more » | almost 3 years ago | |||
| Ag8n | "Out of curiosity only. " | Read more » | almost 3 years ago |