[nldunne]

I just tested the Highlighats on Value 7 bright and 4 darkish in Negative illustration above. Value 7 worked the bright of the Negative image which is Value 4 in the Normal brightness Image. Vaule 4 matched the darker part of the skin in the Negative and bighter part of the skin (Right Cheek) of the subject. This works well for a double check as the Value 4 is directly above Value 7 on the GRAY SCALE & VALUE FINDER. This is also like doing GRISAILLE on the Negative as much as on the real Black and White.
The Values I get doing this check on the Negative Image in Hue Saturation, I note down, and apply the same Values to my real life black and white and color images.