It is a reminder to get more out of the teachings you receive.
Dream dictionary: Alchemist dream meanings
…Dreaming of being in a laboratory, denotes great energies wasted in unfruitful enterprises when you might succeed in some more practical business. If you think yourself an alchemist, and try to discover a process to turn other things into gold, you will entertain far-reaching and interesting projects, but you will fail to reach the apex of your ambition. Wealth will prove a myth, and the woman you love will hold a false position towards you….