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In page Phlogiston theory:

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Eventually, quantitative experiments revealed problems, including the fact that some metals gained mass after they burned, even though they were supposed to have lost phlogiston. Some phlogiston proponents, like Robert Boyle,[1] explained this by concluding that phlogiston has negative mass; others, such as Louis-Bernard Guyton de Morveau, gave the more conventional argument that it is lighter than air. However, a more detailed analysis based on Archimedes' principle, the densities of magnesium and its combustion product showed that just being lighter than air could not account for the increase in mass.[citation needed] Stahl himself did not address the problem of the metals that burn gaining mass, but those who followed his school of thought worked on this problem.[2]