Abstract: An apparatus includes multiple first reservoirs and multiple second reservoirs joined with a substrate. Selected ones of the multiple first reservoirs include a reducing agent, and first reservoir surfaces of selected ones of the multiple first reservoirs are proximate to a first substrate surface. Selected ones of the multiple second reservoirs include an oxidizing agent, and second reservoir surfaces of selected ones of the multiple second reservoirs are proximate to the first substrate surface.

Abstract: An apparatus includes multiple first reservoirs and multiple second reservoirs joined with a substrate. Selected ones of the multiple first reservoirs include a reducing agent, and first reservoir surfaces of selected ones of the multiple first reservoirs are proximate to a first substrate surface. Selected ones of the multiple second reservoirs include an oxidizing agent, and second reservoir surfaces of selected ones of the multiple second reservoirs are proximate to the first substrate surface.

Abstract: In one embodiment, a digital audio player may select an album art file to represent an audio album from multiple possible art files. The digital audio player may store an audio album organized by a content provider compiling multiple audio tracks from multiple audio sources. The digital audio player may check a track art file set associated with the multiple audio tracks from the multiple audio sources. The digital audio player may apply an art selection criteria specifying a presentation of an image to a user to the track art file set. The digital audio player may select an album art file by applying the art selection criteria to the track art file set. The digital audio player may display the album art file to a user to represent the audio album.