If you're an organised type, then you probably already scan receipts printed on thermal paper (that glossy, fax-like stuff) because you know that ink on that paper fades over time. It turns out that could have an added benefit: the paper itself might be more than usually toxic.
Picture by rooreynolds
The blog for Niggle It (the receipts and warranties in the cloud service we looked at recently) rounds up research which suggests that thermal receipts carry extremely high amounts of bisphenol A, a chemical that's been linked with infant brain development issues. Getting organised is often its own reward, but in this case there's an obvious additional incentive to get around to scanning and storing your receipts.
The common receipt could be toxic with BPA [Niggle It Blog]