From
FlavourArt's website:
"Magic Mask acts at the tongue receptors level, temporarily reducing the acid perception, thus improving the overall mouth feel. Its action last 5-8 seconds and involve only the acid receptors."
This is like MTS
vape Wizard, in that it works by altering the tongue's sensitivity to acids, for a brief time (instead of adding/altering the actual flavor components).
Magic mask reduces the tongue's ability to perceive acidic notes (bitter/sour).