DYK that store, hotel & library receipts, airline & movie tickets are technically recyclable? But you might want to think twice. Most are a thermal paper that prints using heat and chemicals (which is why they discolor in a hot car). The paper is currently coated in bisphenol A (BPA), which is potentially harmful to kids and pregnant women. To test for BPA, scratch the receipt with a fingernail or coin to see if it discolors. The BPA could end up in our recycled paper products. So throw them away and choose an electronic receipt (or none at all) when you can.