Audrey Santo's Weeping Oil: Laboratory Analysis Identifies Corn, Soybean, and Animal Fat

Audrey Marie Santo of Worcester, Massachusetts, fell into a persistent vegetative state at age three following a near-drowning accident in 1988. In subsequent years, her family and caregivers reported that religious objects in her room — chalices, crucifixes, pictures, consecrated hosts — would exude or 'weep' an oily substance, and that miraculous healings occurred in association with her presence. The reports drew thousands of visitors and extensive media attention.

Bishop Daniel Patrick Reilly of the Diocese of Worcester appointed a formal commission in the late 1990s. In 1998, oil samples were submitted to Microbac Laboratories in Pittsburgh for chemical analysis. The laboratory identified the substance as approximately 80% corn and soybean oil combined with 20% animal fat — the basic composition of common commercial cooking and food oils. The commission concluded it found no evidence of fraud but also declined to certify any supernatural origin.

A competing analysis was commissioned by the Mercy Foundation, which produced a documentary sympathetic to the Santo family's claims. Boston chemist Boguslaw Lipinski analyzed the oil and described it as an unusual organic compound with 'no identifiable commercial signature.' That conclusion directly conflicts with the Microbac laboratory finding; the Mercy Foundation's advocacy role is relevant context for weighing it.

Audrey Santo died in April 2007 at age 23 from cardiorespiratory failure. The diocese made no definitive ruling on the phenomenon. The Microbac identification of common cooking oil components remains the most concrete forensic finding in the case.