Banks have started applying indelible ink mark on the right hand index finger of customers in select metro cities to stop repeat money exchangers thronging banks with invalid currency notes. In Delhi, 11 branches of SBI and some other banks are using the method to weed out customers queuing up again and again to exchange invalid currency notes. <br/><br/>The move comes amid reports of long queues and chaotic scenes at banks and ATMs across the country after demonetisation of high value currency notes. AIR correspondent reports, long queues can be seen outside banks and ATMs in the national capital. Most of the cash dispensing machines ran out of cash within hours after being stocked, while thousands of ATMs are still not functional. Adding to the customer woes, there have been reports of bank servers facing technical glitches.