Borax doesn’t do that. It actually affects the nervous system of insects, see here: https://homeguides.sfgate.com/insects-borax-chase-away-kill-83399.html http

Borax doesn’t do that. It actually affects the nervous system of insects, see here: https://homeguides.sfgate.com/insects-borax-chase-away-kill-83399.html https://homeguides.sfgate.com/insects-borax-chase-away-kill-... I think you are thinking of silicon dioxide which does get into the chitin of insects: http://npic.orst.edu/factsheets/degen.html http://npic.orst.edu/factsheets/degen.html