Can you use tinctures as preservatives???

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Hi guys,

Recently I was looking over a recipe for a cream I like and it seemed to use tinctures as preservatives. Arnica tincture at ~5.5% and Calendula at ~0.75%. I was wondering are these affective preservatives and I have also read about benzoin tincture is that effective too?
 
Currently there is no natural preservative for cosmetic application. The few herbal concoctions that could be contenders would need to be used in such high percentages as it renders them useless.
 
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