The propeller blades would be RLM 70. Spinner at this time would also be RLM 70 and white. It is most unlikely that the spinner would be black at this time on an E-7, and even less likely that the propeller blades would be anything but the prescribed colour. You can't just slap paint on propellers for fear of causing imbalance and the instructions for the manufacturers were very specific, even specifying the number of coats of lacquer allowed.
The area at the base of each blade, just before it enters the hub, is unpainted metal. It extended 30mm from the hub and was to allow marks for blade adjustment to remain visible. This area wasn't always there (reasons below) but it is clearly visible on your subject.
Here's a translation of the rules for applying camouflage to metal propeller blades and spinners for your (and everybody's) reference.
"Properties of the metal surface
The surfaces of new propeller blades may not be polished. The original paint work on repaired air screws or hoods must be completely removed on both sides.
It will be removed with aviation stripper 7210.00. The stripper is brushed twice onto the old coating for this purpose. The coating is removed with wood wool after it has become completely soft.
The surface of parts from which paint has been removed or which are supplied bare must be thoroughly degreased and cleaned with aviation cleaning agent Z. Priming must start immediately after cleaning to prevent soiling and dust settling on the cleaned parts.
Applying Camouflage paint.
The blades of propellers (suction and pressure sides) and the surface of the spinners must be treated as follows when applying camouflage paint.
a. Aviation lacquer No. 7142
Spray thin.
Thinning ratio 1:1 with aviation thinner 7200.00
Drying time; at least 2 hours.
b. Aviation lacquer No. 7146.71 [this is an undercoat of RLM 71]
Spray
Thinning ratio 1:1 with aviation thinners 7200.00
Drying time: 3 hours.
c. Aviation lacquer No. 7146.70 [this is the top coat of RLM 70]
Spray
Thinning ratio 1;1 with aviation thinners 7200.00
When spraying previously unbalanced propeller blades, care must be taken that a strip 30mm wide above the edge of the spinner is not sprayed so that the mark for blade adjustment remains visible. This area must be protected with masking tape before spraying. The painted propeller blades and spinners must be rebalanced after a drying time of 3 hours, minor balancing errors being eliminated by further spraying with lacquer. Propeller blades and spinners are ready for operation after a further 12 hours. Propeller blades and spinners may not be greased."
As you can see, after cleaning and priming the blades and spinners received an undercoat of RLM 71 (dark green) and then a top coat of RLM 70 (black green). Later in the war, if I'm interpreting another instruction correctly, the undercoat was deleted.
Cheers
Steve