Concerning Saturn Sings:

Saturn alchemy planet symbols are seen in texts as governing the metal lead, which is one of the symbols for dark prime matter.

Understood as having nefarious overtones, Saturn plays an important role in more sinister alchemical processes.

On the other hand, Saturn represents order, strictures, and a gravitational pull to balance and moderation.

Alchemist's understood that Saturn had a very "take matters into hand" energy and utilized this essence in practice as well