Bisphenol S (BPS) is a chemical used as a replacement for bisphenol A (BPS). Companies can say they are BPA-free by using BPS, which is a similar estrogen-like chemical and is probably just as bad.
People avoid canned food because of the BPA can lining, but cash register receipts have 250 to 1,000 times more BPA. It is what makes the inkless heat-activated printing work.