3M(TM) Water Contact Indicator Tape 5557 White, 10.2 mil (0.259 mm) thick, paper backing, with polyester top film and acrylic adhesive, printable, self-adhesive tape that shows area specific, long lasting indication when contacted by water 3M(TM) Water Contact Indicator Tape, used as a water contact indicator in handheld or portable electronic devices such as cell phones, PDA's, pagers, MP3 players, game players, CD players, cordless phones, two-way radios, laptops, digital or film cameras, video cameras, etc. and other applications where positive indication of water or aqueous solution contact is desired