question:  What is Hilary's tone described as "dark" when he remarks that there will be people interested in using his before-shave lotion?
context: SCHOENHERR "What would you think," I asked Marjorie over supper, "if I should undertake to lead a junior achievement group this summer?" It is an uneasy privilege then, at least sometimes, to teach my old-fashioned brand of science to these children of a new age. They manufacture simple compositions like polishing waxes and sell them from door-to-door. Some groups have built up tidy little bank accounts which are available for later educational expenses." Marjorie put back her head and laughed, and I was forced to join her, for we both recognize that my understanding and "feel" for commercial matters—if I may use that expression—is almost nonexistent. Mr. McCormack is going to put up fifty dollars to buy any raw materials wanted And they were all tanned by sun and wind to a degree that made their eyes seem light and their teeth startlingly white. "Well, sure, I suppose we want to," said Hilary. The usual products, of course, with these junior achievement efforts, are chemical specialties that can be made safely and that people will buy and use without misgivings—solvent to free up rusty bolts, cleaner to remove road tar, mechanic's hand soap—that sort of thing. "I'd like to make something by powder metallurgy techniques," said Pete. "You should be able to make ball bearings by molding, then densify them by electroplating." "No, they're formulations—you know, mixtures. "Some," said Hilary, "and I've got a home laboratory." "Well, now," I admitted, "the market for red mice might be rather limited. Denatured alcohol, glycerine, water, a little color and perfume. Men won't use cosmetics and junk, but if they didn't have to admit it, they might like the shave lotion." He said suddenly, "Gosh, I think I know how to make a—what do you want to call it—a before-shave lotion."
output:  He senses that Donald is underestimating the potential of his good idea
options:  He senses that Donald is going to dismiss the idea because it is too costly  He senses that Donald is scheming to patent the idea for his own profiteering  He senses that Donald is beginning to understand his malicious intent for the before-shave lotion  He senses that Donald is underestimating the potential of his good idea