Whipped Cream Difficulties

Wikipedia’s “List of stoffs“.

Because the two substances were so visibly similar, a complex testing system was developed to make sure that each propellant was put into the correct tanks of the Messerschmitt Me 163.

I wonder if it would have been easier to have different sized openings (and different sized nozzles) for the T-Stoff and C-Stoff tanks, instead of a “complex testing system”. But maybe I’m missing something.

(Hattip: TJIC on the Twitter.)