Adhesive tape for masking during chrome plating to protect against blooming, as well as for radiation protection and marking in X-ray technology. 3M Metal Tape 420 is a silver, lead-containing tape coated with a distinctive green rubber-resin adhesive that provides good initial adhesion and long-lasting hold, which peels cleanly from most surfaces. It is an extremely adaptable and flexible tape that can be shaped into detailed and complex forms and patterns. The lead carrier material can be blued to completely cover the adhesive and allow full contact of the lead foil with the metal substrate. This metal-to-metal contact maintains the electrical conduction path and reduces deposits at the adhesive interface. The tape is formulated to be electrically and thermally conductive and has strong resistance to acids and bases, making it ideal for various applications.