jamesl wrote:
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You might try creating a luminosity mask to select the fog itself then work on selectively enhancing it using the mask. I don't know if newer versions of Lightroom offer luminosity masking or not but you can create them in "Photoshop", "Affinity Photo", "Photoshop Elements" and in "ON1 Photo RAW". I am not sure if Topaz offers any luminosity masking capabilities.
Thanks for coming up with a new idea.