Suck 'em and win

时间:2019-03-07 03:19:03166网络整理admin

By Barry Fox Here’s a new twist on instant-win lottery competitions (GB 2353935). Instead of selling scratch cards, lottery operators will sell special drinking straws. The straws are made of polypropylene, impregnated with stripes of coloured dye. The stripes on the lucky straws are covered with a clear resin which changes colour when cooled. When you suck on a cold drink through the lucky straws they change to show red and white stripes, but ordinary ones don’t change colour. The winning straws also react to ultraviolet light, says inventor B&H Liquid Crystal Devices of London,