I was doing a little reading on Long's Thuja out of pure curiosity. Plus, I have lots of Thuja in my yard. I'm wondering, after all the research you've done, what you suspect the recipe is? After reading "A Treatise on Thuja Occidentalis" by Professor H.W. Felter, I believe it's NOT (1) Homeopathic Thuja [vaseline compounds are their go-to topicals, but Long's Thuja is described as being deep green in color] (2) powdered Thuja mixed into vaseline [it was made to be used in open wounds and eyes], (3) essential oil of Thuja mixed with vaseline [in the article, they mention that Thuja essential oil mixed with vaseline would make a compound "similar to Long's Thuja, but inferior."] Long's Thuja is described as having the "full characteristics" of Thuja, so I suspect the whole herb is used, either fresh or dried. I'm wondering if it was gently heated in vaseline, maybe even double, or triple infused, using fresh plant material each time, in order to obtain the required "deep green color" and purported strength. I'd love to hear your thoughts.

Another thought, is it possible that something like a pressure cooker could have been used to make a stronger extract?

... With further reading, I've realized that Long's Thuja seems to have been made by mixing Lloyd's Thuja (a non-alcoholic extract purported to have the consistency of honey) with lard or vaseline. So what we really need is the recipe for Lloyd's Thuja. I found that the Lloyd brothers published a book titled "A Treatise on Thuja Occidentalis." I doubt they would reveal their secret methods in a tell-all book, but it does appear to be 670 pages long. Do you happen to have this book? (I've really gone down the rabbit hole this time)

have no clue how Long’s Thuja was made and it was not a Homeopathic preparation that I do know. Your sleuthing is great but it is conjecture, so we have no way I can think of to figure out how it was made. As I said I spoke with the Lloyd Library to see if they had any records, but sadly nothing was found. The Treatise on Thuja is a booklet, not book (it is probably available on the web) and no they do not say how Lloyds Thuja is made, we do not know how nay of Lloyd Brothers product where made. J.T. Lloyd (Johns son) had the formula books and they disappeared when Lloyd Brothers wa sold by the trustees against his will.

I see. It’s frustrating to know that we will never know for sure exactly what Lloyd’s Thuja was. After I read the Treatise on Thuja, I reached out to Thomas Easley who specializes in Eclectic herbal medicine. He offered some thoughts and also referred me to Fenner’s Twentieth Century Formulary. I read the section on ointments (page 1199 onwards) and took notes from several recipes there. Thomas’s guesses were: (1) lard infusion or (2) dilution of essential oil in lard. I got hung up on the “honey-drip” consistency description that Long used to describe Lloyd’ Thuja. Considering that, I suspect that lanolin or maybe an oil/lard combination were used. Based on the ointment bases used in Fenner’s, it could be olive oil/lard, almond oil/lard, lanolin/lard. Upon further discussion, Thomas recommended starting with olive oil/lard combo, and using an ethanol intermediate for the Thuja. Based on other herbal ointments in Fenner’s, I suspect the Thuja component could be one of these preparations: (1) an herbal water infusion reduced to ¼, (2) a tincture extract reduced to ¼, (3) juice from the herb, (4) actual fresh or freshly dried Thuja infused into the oil. Based on my current understanding, I would guess the essential oil was not used. Internet sources says Thuja leaf essential oil is colorless to pale yellow, whereas Lloyd’s Thuja had a deep green color. The treatise also mentioned that Lloyd’s Thuja contained the “full features” of Thuja and seemed to rate essential oil preparations as lacking. I have many Thuja trees on my property and I’m considering experimenting with them when it warms up… I’ll let you know how it goes. I once tried a quick salve recipe that involved wetting freshly dried herb with just enough alcohol, using a blender to combine it with oil, then straining. It produced an extremely bright green oil that was pretty effective (Self Heal).

Good luck with your experiments, the only way we will ever know what was actually in Longs Thuja is if we can find an unopened bottle and have it analyzed. While there would be a greta deal of degradation and oxidation, it would still be possible chemically to determine if it contained animal fats, what oils, etc. Look on Ebay under pharmaceutical collectables, you never know. I have many unopened bottles of old Lloyd Brothers tinctures, oils, etc. Then find a graduate chemistry student to get involved !