Beta, to standardise oxalic acid, you weigh it pure, dissolve, and titrate against your base like KMnO₄, until the pink colour stays. Getting concordant readings means your hands and eyes must be steady—same endpoint, same way, every time. In my salon, mixing perfect henna colour is like that, waah! If I rush for the next customer, the shade never matches, so I tell my sons, precision cannot hurry, even for rent worries.
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