Also called Bitrex, that stuff does leave an awful taste. Gets used as a denaturant in ethanol to keep people from drinking it. Company I worked at long ago had a stock of it, and our lab had to requalify it for use every 2 years. As careful as we were keeping it contained, it had a way of spreading everywhere. For the next two days everyone who worked in the area would randomly get that awful taste I their mouth.