Argenti Ag-PermaShield is an image silver stabilizer for black and white materials. It protects films and paper from changes in the silver image caused by environmental effects. These faults initially appear as reddish to yellowish-brown highlight discolorations. Recommended as an alternative to Selenium toner for those who want added archival protection without altering the image tone or density of the print. Same features as Agfa SISTAN. "Made in Germany - Absolut Qualität".