I was always told it was boron (or borate?). People always called them boron bombers. Yes, that was a thing. https://www.borax.com/news-events/november-2022/bo

I was always told it was boron (or borate?). People always called them boron bombers. Yes, that was a thing. https://www.borax.com/news-events/november-2022/boron-flame-retardant-history https://www.borax.com/news-events/november-2022/boron-flame-...