I do reuse food storage containers for darkroom chemistry. They do not go back into food storage use when they have finished thier darkroom use.
I use 'mr yuk' stickers I made up from an image I pulled of of the web to label every food container that contains a non food item.
Yes, wide mouth mason jars for many dry chems, as well as glass packer jars meant for dry drug storage use.
Non moisture or oxitation risk chemistry gets stored in plastic wide mount packer jars.