John Trapp on Jeremiah 2:22

Ver. 22. For though thou waſh thee with nitre] Much uſed of old by Fullers and neat Landreſſes, ſay Iſidore and Athanaſius; now not known in theſe parts:Lib. 16. Etym. Lib. de Virg. Nitrum ſordes erodit & expurgat. Plin. Apothecaries uſe Salt-peter inſtead of it. Sin leaveth behind it a deep ſtain, ſo ingrained that it will hardly ever be gotten out: not at all by blanching, extenuating, excuſing, &c. or by any legal purifications, hypocritical lotions. All which notwithſtanding,

Thine iniquitie is marked before me] Nitet iniquitas tua, ſplendet inſtar auri, Piſcat. it gliſters like gold before me, whoſe eyes thou canſt not blind or bleer with any of thy colourable pretexts and pretences.