Related Clues:

• On the plus side?: Abbr.
• Opp. of Pos.
• Photo orig.
• Opposite of Pos.
• Like some ions: Abbr.
• Photo image, briefly
• Neg. opposite
• Photog's original, before digital
• Darkroom item: Abbr.
• Neg. opp.
• Like some poles: Abbr.
• Blowup source, briefly
• Battery terminal abbr.
• Studio orig.
• +, on a batt.