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58Toys that aren't plastic or that require batteries
There are lots of toys that spark the child's imagination that don't require batteries and are not plastic. Tinker toys, Alphabet Blocks, wooden trains and the like. For girls you can get cloth dolls and...
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57What is the meaning of Luminescence
Luminescent material absorbs energy, acts on it and then emits this as light, either immediately or over a longer period, in excess of thermal radiation. This light emission, or exitation energy (in contrast...
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57PhotoLuminescentGlowProducts
Photo luminescent materials (commonly called "glow-in-the-dark") has the ability to absorb light (sunlight, fluorescent, incandescent, etc) and then to emit light. When ambient darkness occurs, it becomes...
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59Photo Luminescent Glow Products
Photo Luminescent Glow Products Photo luminescent materials (commonly called "glow-in-the-dark") Has the ability to absorb light (sunlight, fluorescent, incandescent, etc) and then to emit light. When ambient...
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