I am renovating a 48 year old pond the clay in my area is light Brown to red Brown. I have owned it for twenty years it is dry because of the drought. I am cleaning out the muck but I don't see any color difference from the muck all the way to the rock layer below. Is it normal for clay to take on the color of the muck. Or could it be that the sediment that washed in could have had some clay content and be black like the muck
