"Hydrogen bromide is a colorless, or sometimes faint yellow, highly toxic gas... Hydrogen bromide can react violently when mixed with some chemicals"
Some chemicals are better to make at the site you use them, and only in quantity you will use at the moment. This may be such a chemical. It also is called something else when dissolved in water.
Feels needs a lot of research as there no apparent history, which seems odd if companies buy this from other companies. Regfee Good Luck