Duplicate 'layer set 2' and rename the new set to 'layer set 3'.Hide layer set 2.Create a new layer on top of all these layers in the set.Fill it with white.Change your selected colors back to the default black/white.Go to Filter > Noise > add noiseAdd a lot of noise.Go to Filter > Blur > Gaussion Blur. Change the layer's blending mode to 'Soft Light'.Adjust the layer's opacity to 50%. (repeat gaussion blur if necessary)This will give your image the appearance of oxidation or something like that.It will also blur some sharp features.
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