I wouldn't call alchemy a pseudo-science. Pseudo-science is something pretending to be science but which is not using legitimate scientific methods (falsifiable

I wouldn't call alchemy a pseudo-science. Pseudo-science is something pretending to be science but which is not using legitimate scientific methods (falsifiable hypotheses, reproducible experiments and so on). Alchemy was the study of transformations of matter and did use experiments (rather than just making stuff up, like a typical pseudo-science). Turned out some of the hypotheses were wrong.