I'm lucky enough to be able to taste the difference even between Zero and regular. But if I'm uncertain i either test with my meter or take a mouthful and see if my teeth feels like they're melting

Faster and less sticky than doing the sticky test with fingers lol
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Type1 since october 2004.
Silver Animas 2020 (but on pump break)
MDI: Novorapid and Levemir with Novopen4
Mainly testing with: OneTouch UltraSmart called "The Vampire" and a Freestyle LITE called Buffy
hbA1c feb 2009: 5.1