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INVISIBLE INK Non- Member Price : $16.00 Member Price : $14.40 Although it looks pink in the bottle, this amazing ink goes on to paper wonderfully clear and invisible: it turns blue when the paper is held over a light bulb or other gentle heat source, and then disappears again as the paper cools. It is recommended for use on white paper. Invisible Ink is water-based, and comes in a 1-ounce bottle. Please note the ink is suitable for nibs and glass and quill pens, but should not be used in fountain pens. Item Number: H138/90