Thermal paper receipts, the shiny slips of paper issued by most point-of-sale machines, are coated with bisphenol compounds to produce the printing reaction. For most of their history, that compound was BPA. Following regulatory pressure, many manufacturers switched to BPS. As discussed in our article on BPA alternatives, BPS appears to have similar endocrine-disrupting properties to BPA. The critical issue is not just the presence of these compounds on receipts, but how efficiently they transfer through the skin.
How thermal paper works
Thermal paper produces images without ink. The paper is coated with a chemical developer (BPA or BPS) and a colour former that react when heated by the printer head. BPA or BPS is present as a free compound on the paper surface, not chemically bound, which means it transfers readily on contact. The coating contains approximately 0.5 to 2.2% BPA by weight, making thermal paper one of the highest-concentration BPA sources in everyday consumer contact. A single receipt can contain 17 milligrams of BPA.
Skin absorption data
A 2019 study published in PLOS ONE demonstrated that handling a thermal receipt for 5 seconds transferred detectable BPS to fingers, and that subsequent hand-to-mouth contact resulted in absorption into the bloodstream measurable by urinary BPS testing. Hand sanitiser significantly increased transfer, because alcohol increases skin permeability. The same study showed that moist skin (after washing hands, or in conditions of sweating) absorbed more than dry skin. Handling receipts while eating, a common scenario, creates particularly high exposure because food handling follows receipt handling.
Why cashiers have higher exposure
Occupational studies have consistently found higher urinary BPA and BPS concentrations in cashiers compared to control groups. A 2010 study found that cashiers who wore gloves had significantly lower BPA levels than those who did not. A University of Missouri study found that cashiers handling paper receipts all day had measurable urinary BPA concentrations elevated above population averages. The finding is relevant not just occupationally: anyone who handles significant numbers of receipts (postal workers, restaurant staff, retail staff) faces elevated exposure.
What to do
Request electronic receipts wherever possible. Most retailers can send receipts by email or to a loyalty app. If you must handle a paper receipt, handle it briefly, minimise skin contact area, do not touch food or your face afterwards, and wash hands with soap and water (not hand sanitiser, which increases absorption) promptly. If you handle receipts occupationally, nitrile gloves provide a complete barrier. Store receipts in your phone case or wallet in a separate sleeve rather than directly against other items, as BPA and BPS transfer to banknotes, cards, and other paper items in contact.