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Jun 19 2007, 11:39 AM EDT (current) kjacobso
Jun 19 2007, 11:20 AM EDT kjacobso 194 words added

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During the Golden Age of postcards, from 1898 to 1918, people around the world bought postcards at a torrid pace, sending millions to friends and family members and collecting millions more. The international craze prompted card makers to create imaginative new designs, including “hold-to-lights.”

The images on hold-to-lights undergo a transformation when lit from behind. The cards fall into two main categories: transparencies and die-cuts. Both types are made of thin layers of paper bonded together. On a transparency, the inner layers contain an image that can be seen only when the card is held up to a strong light. On a die-cut, the top layers of paper have been cut away in places—around a candle flame, for instance—to form transparent windows that illuminate when near a light source.

Scarcity usually determines price. The most common cards often show a simple line drawing when held to the light. The most expensive show Santa Clause dressed up as Uncle Sam. The condition of a card has a big bearing on its value, too. Most collectors store their cards in protective covers because prolonged exposure to light causes the colors to fade and destroys their value.