Mary the Jewess is believed to have lived sometime during this broad period. The lack of concrete evidence makes pinpointing a specific birth year impossible. Her existence and contributions are primarily based on citations and descriptions within the works of later alchemists, primarily Zosimos of Panopolis, who wrote several centuries after her time. The uncertainty surrounding her exact lifespan adds to the aura of mystery surrounding this foundational figure in alchemy.

Mary is credited with the invention or significant improvement of several crucial alchemical apparatuses. These inventions are instrumental to early alchemical processes. While the precise details of their original forms are debated, their impact on the evolution of laboratory techniques is undeniable. She is considered a pioneer in what would evolve to become laboratory methodologies.

Zosimos of Panopolis, a prominent alchemist writing several centuries later, is the primary source for our knowledge of Mary the Jewess. He quotes and references her extensively in his alchemical writings, attributing to her the invention of several important devices and techniques. Zosimos's writings are crucial in establishing Mary's position as a foundational figure in alchemy. His reliance on her work solidified her legacy for future generations of alchemists.

Mary is credited with inventing the tribikos, a three-armed distillation apparatus. This device significantly improved the efficiency and control of distillation processes, a fundamental technique in alchemy for separating and purifying substances. The tribikos represents a significant advancement in laboratory equipment and demonstrates Mary's ingenuity in adapting existing technologies to meet the specific needs of alchemical experimentation.

The bain-marie, or water bath, is also attributed to Mary. This technique involves gently heating a substance in a container placed within a larger container of hot water, allowing for controlled and even heating. The bain-marie remains a standard laboratory technique to this day, showcasing the enduring practicality and significance of Mary's contributions. The use of the name 'Balneum Mariae' (Mary's Bath) to describe the bain-marie immortalized her in alchemical practice.

The Kerotakis, a complex apparatus used for coloring metals, is associated with Mary the Jewess. Descriptions of the Kerotakis are somewhat vague and interpretations vary. However, it suggests that Mary was engaged in experimentation with the transformation of metals, a central pursuit of alchemy. The existence of such a sophisticated piece of equipment further underscores her advanced understanding of alchemical principles and techniques.

Mary's teachings, as recorded by Zosimos, suggest that she employed symbolic language and allegory in her alchemical instructions. This practice was common among alchemists to conceal secret knowledge from the uninitiated and to convey deeper philosophical or spiritual meanings alongside the practical instructions. Her utilization of cryptic terminology adds a layer of complexity to her work and invites further interpretation.

Mary the Jewess had a lasting influence on subsequent alchemists. Her inventions, techniques, and teachings were incorporated into the body of alchemical knowledge and passed down through generations of practitioners. Her name became synonymous with ingenuity and innovation in the field. The continued use of her methods for centuries after her death serves as a testament to her pioneering contributions to alchemy.