we sell ssd cl2 solution , which is use for cleaning defaced bank notes ( black bank notes ), we also work on percentage and we are located in Cameroon and we have branches in dubai and china , This product is the latest in the market now and it has been tested many times, we have references if you have any verification contact them , we have well trained technicians to help you do your work, we also have red mercury and humine powder instock , you can visit our laboratory for purchase or cleaning