> doesn’t small quantities like that require highly precise equipment?
0.01% is about one small drop per liter. You can effectively do that yourself if done carefully. For a cubic meter of liquid, that’s 1/10th of a liter, which anyone can measure within 10% without any problem. In reality, they have much larger tanks of the stuff, and then you easily end up adding dozens of liters to reach 0.01%.
Or you even get this iteratively, e.g. making a 1% solution and then make another one from the result.
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