Evaporating tincture?

I have some mason jars of tincture I made with 76% alcohol. It is great/very potent. Moving houses and need to reduce the volume for transport weight. If I leave the lid off the mason jars and let the liquid evaporate naturally (no fan etc) until the liquid is say 25% of the starting volume, do I lose any THC? My plan was to add more alcohol post-transport to bring back to original liquid volume.

No loss of thc, but rather a concentration of potency, so your post-transport plan is spot on if you plan same dosage.

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Your THC (resin) will also come out of solution as your percent water increases and the alcohol decreases.

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Hobbes said:

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Your THC (resin) will also come out of solution as your percent water increases and the alcohol decreases.

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Did I give OP some bum information?

Yes you can evaporate away the alcohol. Faster in a shallow dish with more surface area.

You would have to lose most of the alcohol for the THC to precipitate.