Advantages of Tinctures
Ethanol is able to dissolve substances which are less soluble in water, while at the same time the water content can dissolve the substances less soluble in ethanol. One can sometimes vary the proportion of ethanol and water to produce tinctures with different characteristics due to the distinct solvent properties of these two. Tincture of calendula is commonly tinctured at either 25% or 90% ethanol. The alcohol content also acts as a preservative.
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