I have black dime size stains on the walls and floor of a new aggregate surface I installed last march. Used a Jack's Magic Test kit I bought from Pinch-A-Penny and it tested positive for copper. That was several months ago and I purchased the appropriate chemicals to treat it. I have since spoke to a Jack's Magic Representative and he gave me a test kit from Jack's Magic. This test showed no change in all three tests. Not sure what to do now.