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Hey Hummbling!
"I made a batch of this using everclear. I was very precise and my temps stayed around 165 degrees. When I was finished I ended up with 1/2 of oz. of tincture. Can I add a 1/2 of more everclear to bring that up to 1f ounce of tincture? I thought Id ask first incase the fresh Everclear might alter it in a bad way."
Matanuska is correct.
The only negative effect will be to decrease the potency of a volume - 1 ml of old tincture will have the same potency as 2 ml of the new tincture. Taste will improve as the chlorophyll and terpins extracted by the alcohol are divided over twice the liquid. Alcohol is a near polar solvent which means, for one thing, that it will dissolve both resin and water soluble chlorophyll and terpins that make the tincture green and taste like ass water.
A better alternative, and one you can still do if you want, is to add water to your tincture and heat until all of the alcohol is boiled off. The dissolved resin will come out of solution and sink to the bottom of your jar. Siphon off the green dragon water that contains the chlorophyll and terpins in solution; add a smaller amount of pure clean Everclear to the resin sediment and you have Alcohol Resin Tincture - potent and tasty.
You could also use vegetable glycerin or grape seed oil instead of Everclear for a different type of tincture.
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Steps to increase tincture potency and improve taste:
Add water first then boil off the alcohol. Add water to keep the chlorophyll and terpins off the cannaboid sediment.
If you use a pyrex mason jar it will make the process easier, you can shake it later to dissolve the dried resin.
Heat the tincture with the top off between 79C and 100C. Do not boil the water.
The chlorophyll, terpins and leaf/bud parts will float in the water as the alcohol evaporates.
The resin will settle on the bottom as sediment - heavier than water like ice water hash.
Gently pour or siphon the green water out, any left will carry the green dragon taste to your new tincture.
Pour a small amount of solvent (alcohol, extracts, glycerin) - only enough so the sediment will dissolve and stay in solution.
The less solvent you use the more potent your tincture will be. It should now taste like the solvent, not green dragon.
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If you hadn't cured your bud/trim before making your tincture you could heat the sediment in a pyrex mason jar at 106C for 5 minutes after the resin is completely dry. This will decarboxylize any THCA left in the sediment, giving you more THC and more potency.
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You could use your Everclear in an Alcohol Reflux Extractor to conserve the Everclear, speed extraction and increase extraction efficiency.
https://www.rollitup.org/cooking-cannabis/285016-diy-crock-pot-alcohol-reflux.html
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