Ya said:
Have you had a chance yet to click open the PDF I shared with you? This expensive non-American brand of Ligroin is 100% Light.
Yes, they obviously rounded up to 100% when really it's 99.8% Light and 0.2% Toluene, but the point is, this brand is LIGHT.
This is an interesting thought. I do, however, wonder what basis you have for assuming that "light naphtha" extracts less of the other substances compared to "heavy naphtha". Let me add some details that doesn't solve the hypothesis, but may be helpful in understanding what you're talking about. Light naphtha is defined as a hydrocarbon mixture where the molecules have 5-6 carbon atoms and boils between 30 and 90 C, heavy naphtha have 6-12 carbon atoms and boils between 90 and 200 C. Heptane has 7 carbon atoms and boils at 98 C, hexane 6 carbon atoms (69 C), pentane 5 carbon atoms (36 C) and toluene 7 carbon atoms (110 C).
As "benzine" normally contains the first three of these hydrocarbons it is not a true "light naphtha", but it is indeed close (provided more pentane and hexane than heptane, this will vary between brands). Your example naphtha is also not a true "light naphtha", but if we believe that everything else than the 0.02% toluene meets the requirements it is indeed 99.8% light naphtha. Note that we have
no way of knowing this without a proper MSDS data sheet, as the PDF you attached only defines it as "light naphtha", not defining the actual substances (in other words it's useless). The fact of the matter is that most naphtha contains many different hydrocarbons, often in both "light" and "heavy" category. For example, Coleman Fuel is a mixture of pentane (5 carbon atoms, 36 C - light), cyclohexane (6 carbon atoms, 81 C - light) heptane (7 carbon atoms, 98 C - heavy), octane (8 carbon atoms, 126 C - heavy) and nonane (9 carbon atoms, 151 C - heavy).
I have to add that I have noted absolutely no difference whatsoever when using Coleman Fuel, which is a light/heavy mixture, compared to a heptane and isomers-only (heavy) mixture. Indeed heptane is only slightly on the heavy scale, which may mean that both hydrocarbon mixtures I've used have about the same properties. It may just as well be that suggestive thinking - you know that wonderful placebo effect (think about the case of fake THH from FlowingVisions) - causes your experiences to be different. If we want to test this, we would need a real (proven with an actual MSDS sheet) light naphtha (more or less pure pentane/hexane) to be compared with a light/heavy mixture (Coleman?) and a heavy-only mixture. The resulting products, from several different extractors using the same solvents, must be tested for contaminants with a LC-MS/MS and/or TLC. If not such tests are available, the only other solution is blind studies - favorably double-blind - or we have the problem of placebo again.
Okay, this was just my thoughts on this part of the many subjects you've brought up. I think the hypothesis is interesting, but I'm ambivalent. I'm not saying you're wrong or correct, I'm just adding more data. It may be that you're on to something, but it's absolutely pointless to keep discussing (if we can call this thread an actual discussion) without any actual data. I mean, you haven't even been able to prove that the rolls-royce naphtha you're so fond of actually is light naphtha. An actual MSDS is the very least one would need to even start thinking about the hypothesis, and from there one would need to do several tests with several different solvent mixtures.