Comments

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 » about 2 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 » about 2 years ago
Ag8n " Lichen1.docx Hopefully, this will attach. " | Read more » about 2 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 » about 2 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 » about 2 years ago
Ag8n "Little change here. Most water or liquid measurements are on transmitted or absorbed light. " | Read more » about 2 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 » about 2 years ago
Ag8n "The tungsten lamp remarks only apply to the 660 nm red lines. " | Read more » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 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 » about 2 years ago
Ag8n "This looks great!! Thank you! Is this also a way around all the different platforms ( windows, linux, etc.)? " | Read more » about 2 years ago
Ag8n "How does it compare to wxtoimg? The picture sure looks good. " | Read more » about 2 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 » about 2 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 » about 2 years ago
Ag8n "Out of curiosity only. " | Read more » about 2 years ago