OK thank you.
Oxide red,
Will correct my post about but let me also correct it here. Sorry was thinking only of 69 but for 70 often the area from the firewall forward was sprayed with a batch color and often not the same color or from the same source as the floor from firewall rearward as it states in the article. Have found a few in a red oxide color but the vast majority had a batch color
but then the engine compartment should always be painted in semi-gloss black, right?
The red oxide won't show anymore, right?
The engine compartment and the radiator support would have been painted black along with the section of the cowl visible from the engine compartment (above the cowl to firewall pinch weld), under the exterior painted cowl cover and to the bottom of the windshield opening. There is a recent thread on that detail from the last month or so.
The color red oxide or batch would be visible in the front wheel well over which some body color and black paint would have been applied when those paints were applied by each painter at different times.
Of course the front wheel wells would have received a coating of sound deadener in some areas but not typically over all the outer facing surfaces of the inner fender panels or the back side of the fenders. Often a single pass or two did the job well enough to get it pass the inspectors. Rear wheel wells as shown in the article had sound deadener applied before the exterior color was applied. Same time/station as when the interior and trunk deadener was applied
Is it possible to see some example photos?
The cowl engine compartment paint extension as mentioned above
https://www.concoursmustang.com/forum/index.php?topic=27479.0Real late here at the moment. Will post some wheel well pictures later today