Beware of scratching recharge card with finger....................!!!!!!!!!!! Use coin to Scratch recharge card?? Rumors are going through internet stating"Whenever u buy recharge cards or calling cards don't scratch them with ur nail as it contain 'silver nitro oxide' coating and can cause skin cancer" A message was widely spreading through social networking sites these days saying not to recharge your mobile by scratch cards.The message seems like this: "ATTENTION. .....Medical research Authority of the US have found that new cancer in human beings caused by 'Silver Nitro oxide'. Whenever u buy recharge cards or calling cards don't scratch them with ur nail as it contain 'silver nitro oxide' coating and can cause skin cancer. Copy and paste this status and spread awareness please" Many of the personal websites,forums,face book,twitter,my space etc. have spread this widely. Talking about this to "Engineers World" officials ...