Legitimate mystical and medical alchemists such as Michael Maier and Heinrich Khunrath wrote about fraudulent transmutations, distinguishing themselves from the con artists.
lədʒˈɪɾᵻmət mˈɪstɪkəl ænd mˈɛdɪkəl ˈælkɪmˌɪsts sˈʌtʃ ɐz mˈaɪkəl mˈeɪəɚ ænd hˈaɪnɹɪtʃ kˈʌnɹæθ ɹˈoʊt ɐbˌaʊt fɹˈɔːdʒuːlənt tɹænsmjuːtˈeɪʃənz, dɪstˈɪŋɡwɪʃɪŋ ðɛmsˈɛlvz fɹʌmðə kˈɑːn ˈɑːɹɾɪsts.