Many DC artists used this gray tone process to produce some very artistic covers, most notably Jack Adler and Bob Brown.
But never was the technique employed to the effect achieved in
Never one to rest on his laurels,
Correction: Thanks to Mr. Door Tree, and quoted from his comment: "Adler only did the post production work on it...Bob Brown did the ink wash artwork for this cover! Brown created three other ink wash covers at DC...House of Mystery #92, Tales of the Unexpected #43 and Tomahawk #65."
Thank you for educating me along with my two other readers.
Challengers of the Unknown #11, January 1960.