Whatever the form (salt, FB, still in plant material unextracted), store it in a cool dark and dry place. Silica desiccants and o2 absorbers (like in jerky bags) will help keep it from degrading as well.
Fumaric acid salts seem to be the most stable, for long term storage i would extract all the plant material and end up with a pure fumarate salt. Store it in amber vials, in a airtight/watertight/lightproof container, with silica desiccants and o2 absorbers at a cool temp. theoretically that should last a long time. you could even nitrogen purge the vials with wine preserver if you wanted.
oxygen, heat, moisture, and light. Protect it from those four to the best of your ability and it will last.
To freebase, mix 1:1 fumarate salts with lime (caoh) and hydrate. Fully dehydrate then pull with acetone and evap to get the freebase. Recrystallize if desired.
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