All banks will serve only their respective customers on Saturday and will not exchange the old Rs 500 and Rs 1,000 notes from customers of other banks. However, senior citizens are exempted and they can go to any bank branch to exchange notes on Saturday, said the Indian Banks' Association. "All these days our own customers have suffered because we have not been able to do their work. So, we have seen lot of pending work at branches especially for our existing customers. We, from IBA, have taken a view that tomorrow, that is, on Saturday, we shall be exclusively doing work for our own customers. And tomorrow we will not be doing exchange of notes (for outside customers)," IBA chairman Rajeev Rishi said. Since Wednesday, banks have started applying indelible ink mark on the right hand index finger of customers in the select metro cities to stop repeat money exchangers thronging banks with invalid currency notes. "For the last one week, we have been seeing huge rush but for the last two-three days after we introduced the inking of finger we have seen a visible reduction in the rush at branches. The queues have shortened," Rishi said.