Ok then I will assume now that you currently weigh 80kg.
You should have 22gm in the first glass of SN, and gradually decreasing the amount in the next. That would probably be ~50gm for testing the purity and for the glasses so just in case, I recommend you buy more than 50gm in case of a failed attempt. 100gm or 150gm would be good.
You can use this chart to know how much SN you'll need.
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