Actually to preserve indefinitely it is never a good idea to keep in ANY solution like I said.
I think you can circumvent this by dissolving, dividing and evaporating your lysergamide in an alcohol, or actually any suitable solvent that evaporates nicely, and that of course is able to dissolve the lysergamide and is not 'sticky' like water, oh and not corrosive to any of the plastic materials you might be using in the process!!
To continue: I would propose getting a number of eppendorf vials or something like that, and a syringe that is as accurate as you can find (1 ml, with measurements), then decide exactly how many batches you think you need. Meaning: how many times would you want to divide that - say - 10 mg, to make separate batches each with an unknown but more closeby or 'definite' expiration date.
[Nothing truly lasts indefinitely, but superior storage techniques by chemists have shown lysergamides like LSD - though some may be unusually sensitive like perhaps LSM - to be intact after decades. One thing though is that you may need pharmaceutical grade purification for that, if improper impurities are in your product they may decide the fate more than anything, just like it has to be really dried out. There is 'appearing dry' and there is 'removal of any bound water molecules', as solids can have hydrated forms!]
The point is: you can make a very small solution and divide that over the eppendorf tubes and let it evaporate. This will let the lysergamide precipitate (crash out or settle down) as a solid, and you can store it as such which is a lot more stable for the real extended longevity, as was explained!
Think of it like syrup that you concentrate from juice, but here completely dehydrating it - so that you can 'dilute' and 'activate' it and turn into juice when you want it.
[this can be done with culinary mushrooms, or psychedelic truffles as well for example]
My solid AL-LAD for example: I haven't made that into liquid solution in its entirety, because while that alcoholic solution may keep for a while in the freezer (I assume and trust), I don't want to have all my material in solution having it degrade over time inevitably. So some of it remains protected as a - i hope - dry solid, also in the freezer.
In my case I could use a sub mg balance, but without that - you can use volumetric measurement instead, adding the evaporation.
@BzOH:
Benzyl alcohol is widely used as preservative for injectable solutions etc at a maximum concentration of 1% by law (though I think it is safe to assume they adopt quite a wide margin of error here, for safety, so the really paranoid folks might go to 4% although I cannot vouch for doing that), 0.9% is very common - IDK if its a coincidence that physiological saline eq concentration is also 0.9% salt in solution to eject, and if they thought: well fuck it, let's just make the benzyl alcohol that exact same concentration, so close under the maximum of 1%.
1% means 1 part in 100 benzyl alcohol (in the main solvent), the other 99 parts are the pure water which is the main solvent here.
@legality:
We cannot as a website claim anything about legality, so you cannot take it as fact and base your actions on it - referring to us if you get caught with anything.
I as a person can share my thoughts of course.. laws are different for each country, but there may also be europe wide laws such as the one that apparenty banned mxe. In my country 1P-LSD and ALD-52 are illegal, in a way by accident as the law's definitions most likely were not considering indole amides.
ETH-LAD seems to be illegal in the UK and Switzerland:
https://en.wikipedia.org/wiki/ETH-LAD#Legality
But I wouldn't rule out that it may be considered illegal in other countries in the EU via analogue / catch-all / umbrella type chemical definitions in laws.
