John, if there are black spots on the negative, it could be the printout of a retained silver image caused by bubbles in the fix. This would leave bubbles of unfixed emulsion that turned black.
Insufficient treatment of any negative during fixation can lead to black areas on the negative. This will give light spots on the print.
PE
Insufficient treatment of any negative during fixation can lead to black areas on the negative. This will give light spots on the print.
PE


